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NESPED - Generative AI Reaserch 4

allergy_1

How many students does each advisor have?

medium

Table Allergy_Type ( Allergy_Type.Allergy (VARCHAR(20)), Allergy_Type.AllergyType (VARCHAR(20)), ) Table Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) Table Student ( Student.StuID (INTEGER), Student.LName (VARCHAR(12)), Student.Fname (VARCHAR(12)), Student.Age (INTEGER), Student.Sex (VARCHAR(1)), Student.Major (INTEGER), Student.Advisor (INTEGER), Student.city_code (VARCHAR(3)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

SELECT advisor , count(*) FROM Student GROUP BY advisor

Table allergy_type ( allergy_type.allergy (VARCHAR(20)), allergy_type.allergytype (VARCHAR(20)), ) Table has_allergy ( has_allergy.stuid (INTEGER), has_allergy.allergy (VARCHAR(20)), ) Table student ( student.stuid (INTEGER), student.lname (VARCHAR(12)), student.fname (VARCHAR(12)), student.age (INTEGER), student.sex (VARCHAR(1)), student.major (INTEGER), student.advisor (INTEGER), student.city_code (VARCHAR(3)), ) Possible JOINs: has_allergy.stuid = student.stuid has_allergy.allergy = allergy_type.allergy

{ 'allergy_type': ['allergy', 'allergytype'], 'has_allergy': ['stuid', 'allergy'], 'student': ['stuid', 'lname', 'fname', 'age', 'sex', 'major', 'advisor', 'city_code'] }

{ 'student': ['stuid', 'advisor'] }

TABLE Student ( Student.StuID (INTEGER), Student.Advisor (INTEGER), ) Possible JOINs:

TABLE Student ( Student.StuID (INTEGER), Student.LName (VARCHAR(12)), Student.Fname (VARCHAR(12)), Student.Age (INTEGER), Student.Sex (VARCHAR(1)), Student.Major (INTEGER), Student.Advisor (INTEGER), Student.city_code (VARCHAR(3)), ) Possible JOINs:

allergy_1

Which advisor has most number of students?

hard

Table Allergy_Type ( Allergy_Type.Allergy (VARCHAR(20)), Allergy_Type.AllergyType (VARCHAR(20)), ) Table Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) Table Student ( Student.StuID (INTEGER), Student.LName (VARCHAR(12)), Student.Fname (VARCHAR(12)), Student.Age (INTEGER), Student.Sex (VARCHAR(1)), Student.Major (INTEGER), Student.Advisor (INTEGER), Student.city_code (VARCHAR(3)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

SELECT advisor FROM Student GROUP BY advisor ORDER BY count(*) DESC LIMIT 1

Table allergy_type ( allergy_type.allergy (VARCHAR(20)), allergy_type.allergytype (VARCHAR(20)), ) Table has_allergy ( has_allergy.stuid (INTEGER), has_allergy.allergy (VARCHAR(20)), ) Table student ( student.stuid (INTEGER), student.lname (VARCHAR(12)), student.fname (VARCHAR(12)), student.age (INTEGER), student.sex (VARCHAR(1)), student.major (INTEGER), student.advisor (INTEGER), student.city_code (VARCHAR(3)), ) Possible JOINs: has_allergy.stuid = student.stuid has_allergy.allergy = allergy_type.allergy

{ 'allergy_type': ['allergy', 'allergytype'], 'has_allergy': ['stuid', 'allergy'], 'student': ['stuid', 'lname', 'fname', 'age', 'sex', 'major', 'advisor', 'city_code'] }

{ 'student': ['stuid', 'advisor'] }

TABLE Student ( Student.StuID (INTEGER), Student.Advisor (INTEGER), ) Possible JOINs:

TABLE Student ( Student.StuID (INTEGER), Student.LName (VARCHAR(12)), Student.Fname (VARCHAR(12)), Student.Age (INTEGER), Student.Sex (VARCHAR(1)), Student.Major (INTEGER), Student.Advisor (INTEGER), Student.city_code (VARCHAR(3)), ) Possible JOINs:

allergy_1

Give the advisor with the most students.

hard

Table Allergy_Type ( Allergy_Type.Allergy (VARCHAR(20)), Allergy_Type.AllergyType (VARCHAR(20)), ) Table Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) Table Student ( Student.StuID (INTEGER), Student.LName (VARCHAR(12)), Student.Fname (VARCHAR(12)), Student.Age (INTEGER), Student.Sex (VARCHAR(1)), Student.Major (INTEGER), Student.Advisor (INTEGER), Student.city_code (VARCHAR(3)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

SELECT advisor FROM Student GROUP BY advisor ORDER BY count(*) DESC LIMIT 1

Table allergy_type ( allergy_type.allergy (VARCHAR(20)), allergy_type.allergytype (VARCHAR(20)), ) Table has_allergy ( has_allergy.stuid (INTEGER), has_allergy.allergy (VARCHAR(20)), ) Table student ( student.stuid (INTEGER), student.lname (VARCHAR(12)), student.fname (VARCHAR(12)), student.age (INTEGER), student.sex (VARCHAR(1)), student.major (INTEGER), student.advisor (INTEGER), student.city_code (VARCHAR(3)), ) Possible JOINs: has_allergy.stuid = student.stuid has_allergy.allergy = allergy_type.allergy

{ 'allergy_type': ['allergy', 'allergytype'], 'has_allergy': ['stuid', 'allergy'], 'student': ['stuid', 'lname', 'fname', 'age', 'sex', 'major', 'advisor', 'city_code'] }

{ 'student': ['stuid', 'advisor'] }

TABLE Student ( Student.StuID (INTEGER), Student.Advisor (INTEGER), ) Possible JOINs:

TABLE Student ( Student.StuID (INTEGER), Student.LName (VARCHAR(12)), Student.Fname (VARCHAR(12)), Student.Age (INTEGER), Student.Sex (VARCHAR(1)), Student.Major (INTEGER), Student.Advisor (INTEGER), Student.city_code (VARCHAR(3)), ) Possible JOINs:

allergy_1

How many students have cat allergies?

easy

Table Allergy_Type ( Allergy_Type.Allergy (VARCHAR(20)), Allergy_Type.AllergyType (VARCHAR(20)), ) Table Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) Table Student ( Student.StuID (INTEGER), Student.LName (VARCHAR(12)), Student.Fname (VARCHAR(12)), Student.Age (INTEGER), Student.Sex (VARCHAR(1)), Student.Major (INTEGER), Student.Advisor (INTEGER), Student.city_code (VARCHAR(3)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

SELECT count(*) FROM Has_allergy WHERE Allergy = "Cat"

Table allergy_type ( allergy_type.allergy (VARCHAR(20)), allergy_type.allergytype (VARCHAR(20)), ) Table has_allergy ( has_allergy.stuid (INTEGER), has_allergy.allergy (VARCHAR(20)), ) Table student ( student.stuid (INTEGER), student.lname (VARCHAR(12)), student.fname (VARCHAR(12)), student.age (INTEGER), student.sex (VARCHAR(1)), student.major (INTEGER), student.advisor (INTEGER), student.city_code (VARCHAR(3)), ) Possible JOINs: has_allergy.stuid = student.stuid has_allergy.allergy = allergy_type.allergy

{ 'allergy_type': ['allergy', 'allergytype'], 'has_allergy': ['stuid', 'allergy'], 'student': ['stuid', 'lname', 'fname', 'age', 'sex', 'major', 'advisor', 'city_code'] }

{ 'has_allergy': ['allergy'] }

TABLE Has_Allergy ( Has_Allergy.Allergy (VARCHAR(20)), )

TABLE Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

allergy_1

How many students are affected by cat allergies?

easy

Table Allergy_Type ( Allergy_Type.Allergy (VARCHAR(20)), Allergy_Type.AllergyType (VARCHAR(20)), ) Table Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) Table Student ( Student.StuID (INTEGER), Student.LName (VARCHAR(12)), Student.Fname (VARCHAR(12)), Student.Age (INTEGER), Student.Sex (VARCHAR(1)), Student.Major (INTEGER), Student.Advisor (INTEGER), Student.city_code (VARCHAR(3)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

SELECT count(*) FROM Has_allergy WHERE Allergy = "Cat"

Table allergy_type ( allergy_type.allergy (VARCHAR(20)), allergy_type.allergytype (VARCHAR(20)), ) Table has_allergy ( has_allergy.stuid (INTEGER), has_allergy.allergy (VARCHAR(20)), ) Table student ( student.stuid (INTEGER), student.lname (VARCHAR(12)), student.fname (VARCHAR(12)), student.age (INTEGER), student.sex (VARCHAR(1)), student.major (INTEGER), student.advisor (INTEGER), student.city_code (VARCHAR(3)), ) Possible JOINs: has_allergy.stuid = student.stuid has_allergy.allergy = allergy_type.allergy

{ 'allergy_type': ['allergy', 'allergytype'], 'has_allergy': ['stuid', 'allergy'], 'student': ['stuid', 'lname', 'fname', 'age', 'sex', 'major', 'advisor', 'city_code'] }

{ 'has_allergy': ['allergy'] }

TABLE Has_Allergy ( Has_Allergy.Allergy (VARCHAR(20)), )

TABLE Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

allergy_1

Show all student IDs who have at least two allergies.

easy

Table Allergy_Type ( Allergy_Type.Allergy (VARCHAR(20)), Allergy_Type.AllergyType (VARCHAR(20)), ) Table Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) Table Student ( Student.StuID (INTEGER), Student.LName (VARCHAR(12)), Student.Fname (VARCHAR(12)), Student.Age (INTEGER), Student.Sex (VARCHAR(1)), Student.Major (INTEGER), Student.Advisor (INTEGER), Student.city_code (VARCHAR(3)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

SELECT StuID FROM Has_allergy GROUP BY StuID HAVING count(*) >= 2

Table allergy_type ( allergy_type.allergy (VARCHAR(20)), allergy_type.allergytype (VARCHAR(20)), ) Table has_allergy ( has_allergy.stuid (INTEGER), has_allergy.allergy (VARCHAR(20)), ) Table student ( student.stuid (INTEGER), student.lname (VARCHAR(12)), student.fname (VARCHAR(12)), student.age (INTEGER), student.sex (VARCHAR(1)), student.major (INTEGER), student.advisor (INTEGER), student.city_code (VARCHAR(3)), ) Possible JOINs: has_allergy.stuid = student.stuid has_allergy.allergy = allergy_type.allergy

{ 'allergy_type': ['allergy', 'allergytype'], 'has_allergy': ['stuid', 'allergy'], 'student': ['stuid', 'lname', 'fname', 'age', 'sex', 'major', 'advisor', 'city_code'] }

{ 'has_allergy': ['stuid'] }

TABLE Has_Allergy ( Has_Allergy.StuID (INTEGER), )

TABLE Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

allergy_1

What are the students ids of students who have more than one allergy?

easy

Table Allergy_Type ( Allergy_Type.Allergy (VARCHAR(20)), Allergy_Type.AllergyType (VARCHAR(20)), ) Table Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) Table Student ( Student.StuID (INTEGER), Student.LName (VARCHAR(12)), Student.Fname (VARCHAR(12)), Student.Age (INTEGER), Student.Sex (VARCHAR(1)), Student.Major (INTEGER), Student.Advisor (INTEGER), Student.city_code (VARCHAR(3)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

SELECT StuID FROM Has_allergy GROUP BY StuID HAVING count(*) >= 2

Table allergy_type ( allergy_type.allergy (VARCHAR(20)), allergy_type.allergytype (VARCHAR(20)), ) Table has_allergy ( has_allergy.stuid (INTEGER), has_allergy.allergy (VARCHAR(20)), ) Table student ( student.stuid (INTEGER), student.lname (VARCHAR(12)), student.fname (VARCHAR(12)), student.age (INTEGER), student.sex (VARCHAR(1)), student.major (INTEGER), student.advisor (INTEGER), student.city_code (VARCHAR(3)), ) Possible JOINs: has_allergy.stuid = student.stuid has_allergy.allergy = allergy_type.allergy

{ 'allergy_type': ['allergy', 'allergytype'], 'has_allergy': ['stuid', 'allergy'], 'student': ['stuid', 'lname', 'fname', 'age', 'sex', 'major', 'advisor', 'city_code'] }

{ 'has_allergy': ['stuid'] }

TABLE Has_Allergy ( Has_Allergy.StuID (INTEGER), )

TABLE Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

allergy_1

What are the student ids of students who don't have any allergies?

hard

Table Allergy_Type ( Allergy_Type.Allergy (VARCHAR(20)), Allergy_Type.AllergyType (VARCHAR(20)), ) Table Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) Table Student ( Student.StuID (INTEGER), Student.LName (VARCHAR(12)), Student.Fname (VARCHAR(12)), Student.Age (INTEGER), Student.Sex (VARCHAR(1)), Student.Major (INTEGER), Student.Advisor (INTEGER), Student.city_code (VARCHAR(3)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

SELECT StuID FROM Student EXCEPT SELECT StuID FROM Has_allergy

Table allergy_type ( allergy_type.allergy (VARCHAR(20)), allergy_type.allergytype (VARCHAR(20)), ) Table has_allergy ( has_allergy.stuid (INTEGER), has_allergy.allergy (VARCHAR(20)), ) Table student ( student.stuid (INTEGER), student.lname (VARCHAR(12)), student.fname (VARCHAR(12)), student.age (INTEGER), student.sex (VARCHAR(1)), student.major (INTEGER), student.advisor (INTEGER), student.city_code (VARCHAR(3)), ) Possible JOINs: has_allergy.stuid = student.stuid has_allergy.allergy = allergy_type.allergy

{ 'allergy_type': ['allergy', 'allergytype'], 'has_allergy': ['stuid', 'allergy'], 'student': ['stuid', 'lname', 'fname', 'age', 'sex', 'major', 'advisor', 'city_code'] }

{ 'student': ['stuid'], 'has_allergy': ['stuid'] }

TABLE Has_Allergy ( Has_Allergy.StuID (INTEGER), ) TABLE Student ( Student.StuID (INTEGER), )

TABLE Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) TABLE Student ( Student.StuID (INTEGER), Student.LName (VARCHAR(12)), Student.Fname (VARCHAR(12)), Student.Age (INTEGER), Student.Sex (VARCHAR(1)), Student.Major (INTEGER), Student.Advisor (INTEGER), Student.city_code (VARCHAR(3)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

allergy_1

Which students are unaffected by allergies?

hard

Table Allergy_Type ( Allergy_Type.Allergy (VARCHAR(20)), Allergy_Type.AllergyType (VARCHAR(20)), ) Table Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) Table Student ( Student.StuID (INTEGER), Student.LName (VARCHAR(12)), Student.Fname (VARCHAR(12)), Student.Age (INTEGER), Student.Sex (VARCHAR(1)), Student.Major (INTEGER), Student.Advisor (INTEGER), Student.city_code (VARCHAR(3)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

SELECT StuID FROM Student EXCEPT SELECT StuID FROM Has_allergy

Table allergy_type ( allergy_type.allergy (VARCHAR(20)), allergy_type.allergytype (VARCHAR(20)), ) Table has_allergy ( has_allergy.stuid (INTEGER), has_allergy.allergy (VARCHAR(20)), ) Table student ( student.stuid (INTEGER), student.lname (VARCHAR(12)), student.fname (VARCHAR(12)), student.age (INTEGER), student.sex (VARCHAR(1)), student.major (INTEGER), student.advisor (INTEGER), student.city_code (VARCHAR(3)), ) Possible JOINs: has_allergy.stuid = student.stuid has_allergy.allergy = allergy_type.allergy

{ 'allergy_type': ['allergy', 'allergytype'], 'has_allergy': ['stuid', 'allergy'], 'student': ['stuid', 'lname', 'fname', 'age', 'sex', 'major', 'advisor', 'city_code'] }

{ 'student': ['stuid'], 'has_allergy': ['stuid'] }

TABLE Has_Allergy ( Has_Allergy.StuID (INTEGER), ) TABLE Student ( Student.StuID (INTEGER), )

TABLE Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) TABLE Student ( Student.StuID (INTEGER), Student.LName (VARCHAR(12)), Student.Fname (VARCHAR(12)), Student.Age (INTEGER), Student.Sex (VARCHAR(1)), Student.Major (INTEGER), Student.Advisor (INTEGER), Student.city_code (VARCHAR(3)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

allergy_1

How many female students have milk or egg allergies?

hard

Table Allergy_Type ( Allergy_Type.Allergy (VARCHAR(20)), Allergy_Type.AllergyType (VARCHAR(20)), ) Table Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) Table Student ( Student.StuID (INTEGER), Student.LName (VARCHAR(12)), Student.Fname (VARCHAR(12)), Student.Age (INTEGER), Student.Sex (VARCHAR(1)), Student.Major (INTEGER), Student.Advisor (INTEGER), Student.city_code (VARCHAR(3)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

SELECT count(*) FROM has_allergy JOIN Student ON has_allergy.StuID = Student.StuID WHERE Student.sex = "F" AND has_allergy.allergy = "Milk" OR has_allergy.allergy = "Eggs"

Table allergy_type ( allergy_type.allergy (VARCHAR(20)), allergy_type.allergytype (VARCHAR(20)), ) Table has_allergy ( has_allergy.stuid (INTEGER), has_allergy.allergy (VARCHAR(20)), ) Table student ( student.stuid (INTEGER), student.lname (VARCHAR(12)), student.fname (VARCHAR(12)), student.age (INTEGER), student.sex (VARCHAR(1)), student.major (INTEGER), student.advisor (INTEGER), student.city_code (VARCHAR(3)), ) Possible JOINs: has_allergy.stuid = student.stuid has_allergy.allergy = allergy_type.allergy

{ 'allergy_type': ['allergy', 'allergytype'], 'has_allergy': ['stuid', 'allergy'], 'student': ['stuid', 'lname', 'fname', 'age', 'sex', 'major', 'advisor', 'city_code'] }

{ 'has_allergy': ['stuid', 'allergy'], 'student': ['stuid', 'sex'] }

TABLE Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) TABLE Student ( Student.StuID (INTEGER), Student.Sex (VARCHAR(1)), )

TABLE Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) TABLE Student ( Student.StuID (INTEGER), Student.LName (VARCHAR(12)), Student.Fname (VARCHAR(12)), Student.Age (INTEGER), Student.Sex (VARCHAR(1)), Student.Major (INTEGER), Student.Advisor (INTEGER), Student.city_code (VARCHAR(3)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

allergy_1

How many students who are female are allergic to milk or eggs?

hard

Table Allergy_Type ( Allergy_Type.Allergy (VARCHAR(20)), Allergy_Type.AllergyType (VARCHAR(20)), ) Table Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) Table Student ( Student.StuID (INTEGER), Student.LName (VARCHAR(12)), Student.Fname (VARCHAR(12)), Student.Age (INTEGER), Student.Sex (VARCHAR(1)), Student.Major (INTEGER), Student.Advisor (INTEGER), Student.city_code (VARCHAR(3)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

SELECT count(*) FROM has_allergy JOIN Student ON has_allergy.StuID = Student.StuID WHERE Student.sex = "F" AND has_allergy.allergy = "Milk" OR has_allergy.allergy = "Eggs"

Table allergy_type ( allergy_type.allergy (VARCHAR(20)), allergy_type.allergytype (VARCHAR(20)), ) Table has_allergy ( has_allergy.stuid (INTEGER), has_allergy.allergy (VARCHAR(20)), ) Table student ( student.stuid (INTEGER), student.lname (VARCHAR(12)), student.fname (VARCHAR(12)), student.age (INTEGER), student.sex (VARCHAR(1)), student.major (INTEGER), student.advisor (INTEGER), student.city_code (VARCHAR(3)), ) Possible JOINs: has_allergy.stuid = student.stuid has_allergy.allergy = allergy_type.allergy

{ 'allergy_type': ['allergy', 'allergytype'], 'has_allergy': ['stuid', 'allergy'], 'student': ['stuid', 'lname', 'fname', 'age', 'sex', 'major', 'advisor', 'city_code'] }

{ 'has_allergy': ['stuid', 'allergy'], 'student': ['stuid', 'sex'] }

TABLE Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) TABLE Student ( Student.StuID (INTEGER), Student.Sex (VARCHAR(1)), )

TABLE Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) TABLE Student ( Student.StuID (INTEGER), Student.LName (VARCHAR(12)), Student.Fname (VARCHAR(12)), Student.Age (INTEGER), Student.Sex (VARCHAR(1)), Student.Major (INTEGER), Student.Advisor (INTEGER), Student.city_code (VARCHAR(3)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

allergy_1

How many students have a food allergy?

medium

Table Allergy_Type ( Allergy_Type.Allergy (VARCHAR(20)), Allergy_Type.AllergyType (VARCHAR(20)), ) Table Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) Table Student ( Student.StuID (INTEGER), Student.LName (VARCHAR(12)), Student.Fname (VARCHAR(12)), Student.Age (INTEGER), Student.Sex (VARCHAR(1)), Student.Major (INTEGER), Student.Advisor (INTEGER), Student.city_code (VARCHAR(3)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

SELECT count(*) FROM Has_allergy JOIN Allergy_type ON Has_allergy.allergy = Allergy_type.allergy WHERE Allergy_type.allergytype = "food"

Table allergy_type ( allergy_type.allergy (VARCHAR(20)), allergy_type.allergytype (VARCHAR(20)), ) Table has_allergy ( has_allergy.stuid (INTEGER), has_allergy.allergy (VARCHAR(20)), ) Table student ( student.stuid (INTEGER), student.lname (VARCHAR(12)), student.fname (VARCHAR(12)), student.age (INTEGER), student.sex (VARCHAR(1)), student.major (INTEGER), student.advisor (INTEGER), student.city_code (VARCHAR(3)), ) Possible JOINs: has_allergy.stuid = student.stuid has_allergy.allergy = allergy_type.allergy

{ 'allergy_type': ['allergy', 'allergytype'], 'has_allergy': ['stuid', 'allergy'], 'student': ['stuid', 'lname', 'fname', 'age', 'sex', 'major', 'advisor', 'city_code'] }

{ 'has_allergy': ['allergy'], 'allergy_type': ['allergy', 'allergytype'] }

TABLE Allergy_Type ( Allergy_Type.Allergy (VARCHAR(20)), Allergy_Type.AllergyType (VARCHAR(20)), ) TABLE Has_Allergy ( Has_Allergy.Allergy (VARCHAR(20)), )

TABLE Allergy_Type ( Allergy_Type.Allergy (VARCHAR(20)), Allergy_Type.AllergyType (VARCHAR(20)), ) TABLE Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

allergy_1

How many students are affected by food related allergies?

medium

Table Allergy_Type ( Allergy_Type.Allergy (VARCHAR(20)), Allergy_Type.AllergyType (VARCHAR(20)), ) Table Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) Table Student ( Student.StuID (INTEGER), Student.LName (VARCHAR(12)), Student.Fname (VARCHAR(12)), Student.Age (INTEGER), Student.Sex (VARCHAR(1)), Student.Major (INTEGER), Student.Advisor (INTEGER), Student.city_code (VARCHAR(3)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

SELECT count(*) FROM Has_allergy JOIN Allergy_type ON Has_allergy.allergy = Allergy_type.allergy WHERE Allergy_type.allergytype = "food"

Table allergy_type ( allergy_type.allergy (VARCHAR(20)), allergy_type.allergytype (VARCHAR(20)), ) Table has_allergy ( has_allergy.stuid (INTEGER), has_allergy.allergy (VARCHAR(20)), ) Table student ( student.stuid (INTEGER), student.lname (VARCHAR(12)), student.fname (VARCHAR(12)), student.age (INTEGER), student.sex (VARCHAR(1)), student.major (INTEGER), student.advisor (INTEGER), student.city_code (VARCHAR(3)), ) Possible JOINs: has_allergy.stuid = student.stuid has_allergy.allergy = allergy_type.allergy

{ 'allergy_type': ['allergy', 'allergytype'], 'has_allergy': ['stuid', 'allergy'], 'student': ['stuid', 'lname', 'fname', 'age', 'sex', 'major', 'advisor', 'city_code'] }

{ 'has_allergy': ['allergy'], 'allergy_type': ['allergy', 'allergytype'] }

TABLE Allergy_Type ( Allergy_Type.Allergy (VARCHAR(20)), Allergy_Type.AllergyType (VARCHAR(20)), ) TABLE Has_Allergy ( Has_Allergy.Allergy (VARCHAR(20)), )

TABLE Allergy_Type ( Allergy_Type.Allergy (VARCHAR(20)), Allergy_Type.AllergyType (VARCHAR(20)), ) TABLE Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

allergy_1

Which allergy has most number of students affected?

hard

Table Allergy_Type ( Allergy_Type.Allergy (VARCHAR(20)), Allergy_Type.AllergyType (VARCHAR(20)), ) Table Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) Table Student ( Student.StuID (INTEGER), Student.LName (VARCHAR(12)), Student.Fname (VARCHAR(12)), Student.Age (INTEGER), Student.Sex (VARCHAR(1)), Student.Major (INTEGER), Student.Advisor (INTEGER), Student.city_code (VARCHAR(3)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

SELECT Allergy FROM Has_allergy GROUP BY Allergy ORDER BY count(*) DESC LIMIT 1

Table allergy_type ( allergy_type.allergy (VARCHAR(20)), allergy_type.allergytype (VARCHAR(20)), ) Table has_allergy ( has_allergy.stuid (INTEGER), has_allergy.allergy (VARCHAR(20)), ) Table student ( student.stuid (INTEGER), student.lname (VARCHAR(12)), student.fname (VARCHAR(12)), student.age (INTEGER), student.sex (VARCHAR(1)), student.major (INTEGER), student.advisor (INTEGER), student.city_code (VARCHAR(3)), ) Possible JOINs: has_allergy.stuid = student.stuid has_allergy.allergy = allergy_type.allergy

{ 'allergy_type': ['allergy', 'allergytype'], 'has_allergy': ['stuid', 'allergy'], 'student': ['stuid', 'lname', 'fname', 'age', 'sex', 'major', 'advisor', 'city_code'] }

{ 'has_allergy': ['allergy'] }

TABLE Has_Allergy ( Has_Allergy.Allergy (VARCHAR(20)), )

TABLE Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

allergy_1

Which allergy is the most common?

hard

Table Allergy_Type ( Allergy_Type.Allergy (VARCHAR(20)), Allergy_Type.AllergyType (VARCHAR(20)), ) Table Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) Table Student ( Student.StuID (INTEGER), Student.LName (VARCHAR(12)), Student.Fname (VARCHAR(12)), Student.Age (INTEGER), Student.Sex (VARCHAR(1)), Student.Major (INTEGER), Student.Advisor (INTEGER), Student.city_code (VARCHAR(3)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

SELECT Allergy FROM Has_allergy GROUP BY Allergy ORDER BY count(*) DESC LIMIT 1

Table allergy_type ( allergy_type.allergy (VARCHAR(20)), allergy_type.allergytype (VARCHAR(20)), ) Table has_allergy ( has_allergy.stuid (INTEGER), has_allergy.allergy (VARCHAR(20)), ) Table student ( student.stuid (INTEGER), student.lname (VARCHAR(12)), student.fname (VARCHAR(12)), student.age (INTEGER), student.sex (VARCHAR(1)), student.major (INTEGER), student.advisor (INTEGER), student.city_code (VARCHAR(3)), ) Possible JOINs: has_allergy.stuid = student.stuid has_allergy.allergy = allergy_type.allergy

{ 'allergy_type': ['allergy', 'allergytype'], 'has_allergy': ['stuid', 'allergy'], 'student': ['stuid', 'lname', 'fname', 'age', 'sex', 'major', 'advisor', 'city_code'] }

{ 'has_allergy': ['allergy'] }

TABLE Has_Allergy ( Has_Allergy.Allergy (VARCHAR(20)), )

TABLE Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

allergy_1

Show all allergies with number of students affected.

medium

Table Allergy_Type ( Allergy_Type.Allergy (VARCHAR(20)), Allergy_Type.AllergyType (VARCHAR(20)), ) Table Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) Table Student ( Student.StuID (INTEGER), Student.LName (VARCHAR(12)), Student.Fname (VARCHAR(12)), Student.Age (INTEGER), Student.Sex (VARCHAR(1)), Student.Major (INTEGER), Student.Advisor (INTEGER), Student.city_code (VARCHAR(3)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

SELECT Allergy , count(*) FROM Has_allergy GROUP BY Allergy

Table allergy_type ( allergy_type.allergy (VARCHAR(20)), allergy_type.allergytype (VARCHAR(20)), ) Table has_allergy ( has_allergy.stuid (INTEGER), has_allergy.allergy (VARCHAR(20)), ) Table student ( student.stuid (INTEGER), student.lname (VARCHAR(12)), student.fname (VARCHAR(12)), student.age (INTEGER), student.sex (VARCHAR(1)), student.major (INTEGER), student.advisor (INTEGER), student.city_code (VARCHAR(3)), ) Possible JOINs: has_allergy.stuid = student.stuid has_allergy.allergy = allergy_type.allergy

{ 'allergy_type': ['allergy', 'allergytype'], 'has_allergy': ['stuid', 'allergy'], 'student': ['stuid', 'lname', 'fname', 'age', 'sex', 'major', 'advisor', 'city_code'] }

{ 'has_allergy': ['allergy'] }

TABLE Has_Allergy ( Has_Allergy.Allergy (VARCHAR(20)), )

TABLE Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

allergy_1

How many students have each different allergy?

medium

Table Allergy_Type ( Allergy_Type.Allergy (VARCHAR(20)), Allergy_Type.AllergyType (VARCHAR(20)), ) Table Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) Table Student ( Student.StuID (INTEGER), Student.LName (VARCHAR(12)), Student.Fname (VARCHAR(12)), Student.Age (INTEGER), Student.Sex (VARCHAR(1)), Student.Major (INTEGER), Student.Advisor (INTEGER), Student.city_code (VARCHAR(3)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

SELECT Allergy , count(*) FROM Has_allergy GROUP BY Allergy

Table allergy_type ( allergy_type.allergy (VARCHAR(20)), allergy_type.allergytype (VARCHAR(20)), ) Table has_allergy ( has_allergy.stuid (INTEGER), has_allergy.allergy (VARCHAR(20)), ) Table student ( student.stuid (INTEGER), student.lname (VARCHAR(12)), student.fname (VARCHAR(12)), student.age (INTEGER), student.sex (VARCHAR(1)), student.major (INTEGER), student.advisor (INTEGER), student.city_code (VARCHAR(3)), ) Possible JOINs: has_allergy.stuid = student.stuid has_allergy.allergy = allergy_type.allergy

{ 'allergy_type': ['allergy', 'allergytype'], 'has_allergy': ['stuid', 'allergy'], 'student': ['stuid', 'lname', 'fname', 'age', 'sex', 'major', 'advisor', 'city_code'] }

{ 'has_allergy': ['allergy'] }

TABLE Has_Allergy ( Has_Allergy.Allergy (VARCHAR(20)), )

TABLE Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

allergy_1

Show all allergy type with number of students affected.

medium

Table Allergy_Type ( Allergy_Type.Allergy (VARCHAR(20)), Allergy_Type.AllergyType (VARCHAR(20)), ) Table Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) Table Student ( Student.StuID (INTEGER), Student.LName (VARCHAR(12)), Student.Fname (VARCHAR(12)), Student.Age (INTEGER), Student.Sex (VARCHAR(1)), Student.Major (INTEGER), Student.Advisor (INTEGER), Student.city_code (VARCHAR(3)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

SELECT Allergy_type.allergytype , count(*) FROM Has_allergy JOIN Allergy_type ON Has_allergy.allergy = Allergy_type.allergy GROUP BY Allergy_type.allergytype

Table allergy_type ( allergy_type.allergy (VARCHAR(20)), allergy_type.allergytype (VARCHAR(20)), ) Table has_allergy ( has_allergy.stuid (INTEGER), has_allergy.allergy (VARCHAR(20)), ) Table student ( student.stuid (INTEGER), student.lname (VARCHAR(12)), student.fname (VARCHAR(12)), student.age (INTEGER), student.sex (VARCHAR(1)), student.major (INTEGER), student.advisor (INTEGER), student.city_code (VARCHAR(3)), ) Possible JOINs: has_allergy.stuid = student.stuid has_allergy.allergy = allergy_type.allergy

{ 'allergy_type': ['allergy', 'allergytype'], 'has_allergy': ['stuid', 'allergy'], 'student': ['stuid', 'lname', 'fname', 'age', 'sex', 'major', 'advisor', 'city_code'] }

{ 'has_allergy': ['allergy'], 'allergy_type': ['allergy', 'allergytype'] }

TABLE Allergy_Type ( Allergy_Type.Allergy (VARCHAR(20)), Allergy_Type.AllergyType (VARCHAR(20)), ) TABLE Has_Allergy ( Has_Allergy.Allergy (VARCHAR(20)), )

TABLE Allergy_Type ( Allergy_Type.Allergy (VARCHAR(20)), Allergy_Type.AllergyType (VARCHAR(20)), ) TABLE Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

allergy_1

How many students are affected by each allergy type?

medium

Table Allergy_Type ( Allergy_Type.Allergy (VARCHAR(20)), Allergy_Type.AllergyType (VARCHAR(20)), ) Table Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) Table Student ( Student.StuID (INTEGER), Student.LName (VARCHAR(12)), Student.Fname (VARCHAR(12)), Student.Age (INTEGER), Student.Sex (VARCHAR(1)), Student.Major (INTEGER), Student.Advisor (INTEGER), Student.city_code (VARCHAR(3)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

SELECT Allergy_type.allergytype , count(*) FROM Has_allergy JOIN Allergy_type ON Has_allergy.allergy = Allergy_type.allergy GROUP BY Allergy_type.allergytype

Table allergy_type ( allergy_type.allergy (VARCHAR(20)), allergy_type.allergytype (VARCHAR(20)), ) Table has_allergy ( has_allergy.stuid (INTEGER), has_allergy.allergy (VARCHAR(20)), ) Table student ( student.stuid (INTEGER), student.lname (VARCHAR(12)), student.fname (VARCHAR(12)), student.age (INTEGER), student.sex (VARCHAR(1)), student.major (INTEGER), student.advisor (INTEGER), student.city_code (VARCHAR(3)), ) Possible JOINs: has_allergy.stuid = student.stuid has_allergy.allergy = allergy_type.allergy

{ 'allergy_type': ['allergy', 'allergytype'], 'has_allergy': ['stuid', 'allergy'], 'student': ['stuid', 'lname', 'fname', 'age', 'sex', 'major', 'advisor', 'city_code'] }

{ 'has_allergy': ['allergy'], 'allergy_type': ['allergy', 'allergytype'] }

TABLE Allergy_Type ( Allergy_Type.Allergy (VARCHAR(20)), Allergy_Type.AllergyType (VARCHAR(20)), ) TABLE Has_Allergy ( Has_Allergy.Allergy (VARCHAR(20)), )

TABLE Allergy_Type ( Allergy_Type.Allergy (VARCHAR(20)), Allergy_Type.AllergyType (VARCHAR(20)), ) TABLE Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

allergy_1

Find the last name and age of the student who has allergy to both milk and cat.

extra

Table Allergy_Type ( Allergy_Type.Allergy (VARCHAR(20)), Allergy_Type.AllergyType (VARCHAR(20)), ) Table Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) Table Student ( Student.StuID (INTEGER), Student.LName (VARCHAR(12)), Student.Fname (VARCHAR(12)), Student.Age (INTEGER), Student.Sex (VARCHAR(1)), Student.Major (INTEGER), Student.Advisor (INTEGER), Student.city_code (VARCHAR(3)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

SELECT lname , age FROM Student WHERE StuID IN (SELECT StuID FROM Has_allergy WHERE Allergy = "Milk" INTERSECT SELECT StuID FROM Has_allergy WHERE Allergy = "Cat")

Table allergy_type ( allergy_type.allergy (VARCHAR(20)), allergy_type.allergytype (VARCHAR(20)), ) Table has_allergy ( has_allergy.stuid (INTEGER), has_allergy.allergy (VARCHAR(20)), ) Table student ( student.stuid (INTEGER), student.lname (VARCHAR(12)), student.fname (VARCHAR(12)), student.age (INTEGER), student.sex (VARCHAR(1)), student.major (INTEGER), student.advisor (INTEGER), student.city_code (VARCHAR(3)), ) Possible JOINs: has_allergy.stuid = student.stuid has_allergy.allergy = allergy_type.allergy

{ 'allergy_type': ['allergy', 'allergytype'], 'has_allergy': ['stuid', 'allergy'], 'student': ['stuid', 'lname', 'fname', 'age', 'sex', 'major', 'advisor', 'city_code'] }

{ 'student': ['stuid', 'lname', 'age'], 'has_allergy': ['stuid', 'allergy'] }

TABLE Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) TABLE Student ( Student.StuID (INTEGER), Student.LName (VARCHAR(12)), Student.Age (INTEGER), )

TABLE Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) TABLE Student ( Student.StuID (INTEGER), Student.LName (VARCHAR(12)), Student.Fname (VARCHAR(12)), Student.Age (INTEGER), Student.Sex (VARCHAR(1)), Student.Major (INTEGER), Student.Advisor (INTEGER), Student.city_code (VARCHAR(3)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

allergy_1

What are the last names and ages of the students who are allergic to milk and cat?

extra

Table Allergy_Type ( Allergy_Type.Allergy (VARCHAR(20)), Allergy_Type.AllergyType (VARCHAR(20)), ) Table Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) Table Student ( Student.StuID (INTEGER), Student.LName (VARCHAR(12)), Student.Fname (VARCHAR(12)), Student.Age (INTEGER), Student.Sex (VARCHAR(1)), Student.Major (INTEGER), Student.Advisor (INTEGER), Student.city_code (VARCHAR(3)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

SELECT lname , age FROM Student WHERE StuID IN (SELECT StuID FROM Has_allergy WHERE Allergy = "Milk" INTERSECT SELECT StuID FROM Has_allergy WHERE Allergy = "Cat")

Table allergy_type ( allergy_type.allergy (VARCHAR(20)), allergy_type.allergytype (VARCHAR(20)), ) Table has_allergy ( has_allergy.stuid (INTEGER), has_allergy.allergy (VARCHAR(20)), ) Table student ( student.stuid (INTEGER), student.lname (VARCHAR(12)), student.fname (VARCHAR(12)), student.age (INTEGER), student.sex (VARCHAR(1)), student.major (INTEGER), student.advisor (INTEGER), student.city_code (VARCHAR(3)), ) Possible JOINs: has_allergy.stuid = student.stuid has_allergy.allergy = allergy_type.allergy

{ 'allergy_type': ['allergy', 'allergytype'], 'has_allergy': ['stuid', 'allergy'], 'student': ['stuid', 'lname', 'fname', 'age', 'sex', 'major', 'advisor', 'city_code'] }

{ 'student': ['stuid', 'lname', 'age'], 'has_allergy': ['stuid', 'allergy'] }

TABLE Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) TABLE Student ( Student.StuID (INTEGER), Student.LName (VARCHAR(12)), Student.Age (INTEGER), )

TABLE Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) TABLE Student ( Student.StuID (INTEGER), Student.LName (VARCHAR(12)), Student.Fname (VARCHAR(12)), Student.Age (INTEGER), Student.Sex (VARCHAR(1)), Student.Major (INTEGER), Student.Advisor (INTEGER), Student.city_code (VARCHAR(3)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

allergy_1

What are the allergies and their types that the student with first name Lisa has? And order the result by name of allergies.

extra

Table Allergy_Type ( Allergy_Type.Allergy (VARCHAR(20)), Allergy_Type.AllergyType (VARCHAR(20)), ) Table Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) Table Student ( Student.StuID (INTEGER), Student.LName (VARCHAR(12)), Student.Fname (VARCHAR(12)), Student.Age (INTEGER), Student.Sex (VARCHAR(1)), Student.Major (INTEGER), Student.Advisor (INTEGER), Student.city_code (VARCHAR(3)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

SELECT Allergy_type.Allergy , Allergy_type.AllergyType FROM Allergy_type JOIN Has_allergy ON Allergy_type.Allergy = Has_allergy.Allergy JOIN Student ON Student.StuID = Has_allergy.StuID WHERE Student.Fname = "Lisa" ORDER BY Allergy_type.Allergy

Table allergy_type ( allergy_type.allergy (VARCHAR(20)), allergy_type.allergytype (VARCHAR(20)), ) Table has_allergy ( has_allergy.stuid (INTEGER), has_allergy.allergy (VARCHAR(20)), ) Table student ( student.stuid (INTEGER), student.lname (VARCHAR(12)), student.fname (VARCHAR(12)), student.age (INTEGER), student.sex (VARCHAR(1)), student.major (INTEGER), student.advisor (INTEGER), student.city_code (VARCHAR(3)), ) Possible JOINs: has_allergy.stuid = student.stuid has_allergy.allergy = allergy_type.allergy

{ 'allergy_type': ['allergy', 'allergytype'], 'has_allergy': ['stuid', 'allergy'], 'student': ['stuid', 'lname', 'fname', 'age', 'sex', 'major', 'advisor', 'city_code'] }

{ 'allergy_type': ['allergy', 'allergytype'], 'has_allergy': ['stuid', 'allergy'], 'student': ['stuid', 'fname'] }

TABLE Allergy_Type ( Allergy_Type.Allergy (VARCHAR(20)), Allergy_Type.AllergyType (VARCHAR(20)), ) TABLE Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) TABLE Student ( Student.StuID (INTEGER), Student.Fname (VARCHAR(12)), )

TABLE Allergy_Type ( Allergy_Type.Allergy (VARCHAR(20)), Allergy_Type.AllergyType (VARCHAR(20)), ) TABLE Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) TABLE Student ( Student.StuID (INTEGER), Student.LName (VARCHAR(12)), Student.Fname (VARCHAR(12)), Student.Age (INTEGER), Student.Sex (VARCHAR(1)), Student.Major (INTEGER), Student.Advisor (INTEGER), Student.city_code (VARCHAR(3)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

allergy_1

What are the allergies the girl named Lisa has? And what are the types of them? Order the result by allergy names.

extra

Table Allergy_Type ( Allergy_Type.Allergy (VARCHAR(20)), Allergy_Type.AllergyType (VARCHAR(20)), ) Table Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) Table Student ( Student.StuID (INTEGER), Student.LName (VARCHAR(12)), Student.Fname (VARCHAR(12)), Student.Age (INTEGER), Student.Sex (VARCHAR(1)), Student.Major (INTEGER), Student.Advisor (INTEGER), Student.city_code (VARCHAR(3)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

SELECT Allergy_type.Allergy , Allergy_type.AllergyType FROM Allergy_type JOIN Has_allergy ON Allergy_type.Allergy = Has_allergy.Allergy JOIN Student ON Student.StuID = Has_allergy.StuID WHERE Student.Fname = "Lisa" ORDER BY Allergy_type.Allergy

Table allergy_type ( allergy_type.allergy (VARCHAR(20)), allergy_type.allergytype (VARCHAR(20)), ) Table has_allergy ( has_allergy.stuid (INTEGER), has_allergy.allergy (VARCHAR(20)), ) Table student ( student.stuid (INTEGER), student.lname (VARCHAR(12)), student.fname (VARCHAR(12)), student.age (INTEGER), student.sex (VARCHAR(1)), student.major (INTEGER), student.advisor (INTEGER), student.city_code (VARCHAR(3)), ) Possible JOINs: has_allergy.stuid = student.stuid has_allergy.allergy = allergy_type.allergy

{ 'allergy_type': ['allergy', 'allergytype'], 'has_allergy': ['stuid', 'allergy'], 'student': ['stuid', 'lname', 'fname', 'age', 'sex', 'major', 'advisor', 'city_code'] }

{ 'allergy_type': ['allergy', 'allergytype'], 'has_allergy': ['stuid', 'allergy'], 'student': ['stuid', 'fname'] }

TABLE Allergy_Type ( Allergy_Type.Allergy (VARCHAR(20)), Allergy_Type.AllergyType (VARCHAR(20)), ) TABLE Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) TABLE Student ( Student.StuID (INTEGER), Student.Fname (VARCHAR(12)), )

TABLE Allergy_Type ( Allergy_Type.Allergy (VARCHAR(20)), Allergy_Type.AllergyType (VARCHAR(20)), ) TABLE Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) TABLE Student ( Student.StuID (INTEGER), Student.LName (VARCHAR(12)), Student.Fname (VARCHAR(12)), Student.Age (INTEGER), Student.Sex (VARCHAR(1)), Student.Major (INTEGER), Student.Advisor (INTEGER), Student.city_code (VARCHAR(3)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

allergy_1

Find the first name and gender of the student who has allergy to milk but not cat.

extra

Table Allergy_Type ( Allergy_Type.Allergy (VARCHAR(20)), Allergy_Type.AllergyType (VARCHAR(20)), ) Table Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) Table Student ( Student.StuID (INTEGER), Student.LName (VARCHAR(12)), Student.Fname (VARCHAR(12)), Student.Age (INTEGER), Student.Sex (VARCHAR(1)), Student.Major (INTEGER), Student.Advisor (INTEGER), Student.city_code (VARCHAR(3)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

SELECT fname , sex FROM Student WHERE StuID IN (SELECT StuID FROM Has_allergy WHERE Allergy = "Milk" EXCEPT SELECT StuID FROM Has_allergy WHERE Allergy = "Cat")

Table allergy_type ( allergy_type.allergy (VARCHAR(20)), allergy_type.allergytype (VARCHAR(20)), ) Table has_allergy ( has_allergy.stuid (INTEGER), has_allergy.allergy (VARCHAR(20)), ) Table student ( student.stuid (INTEGER), student.lname (VARCHAR(12)), student.fname (VARCHAR(12)), student.age (INTEGER), student.sex (VARCHAR(1)), student.major (INTEGER), student.advisor (INTEGER), student.city_code (VARCHAR(3)), ) Possible JOINs: has_allergy.stuid = student.stuid has_allergy.allergy = allergy_type.allergy

{ 'allergy_type': ['allergy', 'allergytype'], 'has_allergy': ['stuid', 'allergy'], 'student': ['stuid', 'lname', 'fname', 'age', 'sex', 'major', 'advisor', 'city_code'] }

{ 'student': ['stuid', 'fname', 'sex'], 'has_allergy': ['stuid', 'allergy'] }

TABLE Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) TABLE Student ( Student.StuID (INTEGER), Student.Fname (VARCHAR(12)), Student.Sex (VARCHAR(1)), )

TABLE Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) TABLE Student ( Student.StuID (INTEGER), Student.LName (VARCHAR(12)), Student.Fname (VARCHAR(12)), Student.Age (INTEGER), Student.Sex (VARCHAR(1)), Student.Major (INTEGER), Student.Advisor (INTEGER), Student.city_code (VARCHAR(3)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

allergy_1

What are the first name and gender of the students who have allergy to milk but can put up with cats?

extra

Table Allergy_Type ( Allergy_Type.Allergy (VARCHAR(20)), Allergy_Type.AllergyType (VARCHAR(20)), ) Table Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) Table Student ( Student.StuID (INTEGER), Student.LName (VARCHAR(12)), Student.Fname (VARCHAR(12)), Student.Age (INTEGER), Student.Sex (VARCHAR(1)), Student.Major (INTEGER), Student.Advisor (INTEGER), Student.city_code (VARCHAR(3)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

SELECT fname , sex FROM Student WHERE StuID IN (SELECT StuID FROM Has_allergy WHERE Allergy = "Milk" EXCEPT SELECT StuID FROM Has_allergy WHERE Allergy = "Cat")

Table allergy_type ( allergy_type.allergy (VARCHAR(20)), allergy_type.allergytype (VARCHAR(20)), ) Table has_allergy ( has_allergy.stuid (INTEGER), has_allergy.allergy (VARCHAR(20)), ) Table student ( student.stuid (INTEGER), student.lname (VARCHAR(12)), student.fname (VARCHAR(12)), student.age (INTEGER), student.sex (VARCHAR(1)), student.major (INTEGER), student.advisor (INTEGER), student.city_code (VARCHAR(3)), ) Possible JOINs: has_allergy.stuid = student.stuid has_allergy.allergy = allergy_type.allergy

{ 'allergy_type': ['allergy', 'allergytype'], 'has_allergy': ['stuid', 'allergy'], 'student': ['stuid', 'lname', 'fname', 'age', 'sex', 'major', 'advisor', 'city_code'] }

{ 'student': ['stuid', 'fname', 'sex'], 'has_allergy': ['stuid', 'allergy'] }

TABLE Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) TABLE Student ( Student.StuID (INTEGER), Student.Fname (VARCHAR(12)), Student.Sex (VARCHAR(1)), )

TABLE Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) TABLE Student ( Student.StuID (INTEGER), Student.LName (VARCHAR(12)), Student.Fname (VARCHAR(12)), Student.Age (INTEGER), Student.Sex (VARCHAR(1)), Student.Major (INTEGER), Student.Advisor (INTEGER), Student.city_code (VARCHAR(3)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

allergy_1

Find the average age of the students who have allergies with food and animal types.

hard

Table Allergy_Type ( Allergy_Type.Allergy (VARCHAR(20)), Allergy_Type.AllergyType (VARCHAR(20)), ) Table Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) Table Student ( Student.StuID (INTEGER), Student.LName (VARCHAR(12)), Student.Fname (VARCHAR(12)), Student.Age (INTEGER), Student.Sex (VARCHAR(1)), Student.Major (INTEGER), Student.Advisor (INTEGER), Student.city_code (VARCHAR(3)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

SELECT avg(age) FROM Student WHERE StuID IN ( SELECT Has_allergy.StuID FROM Has_allergy JOIN Allergy_Type ON Has_allergy.Allergy = Allergy_Type.Allergy WHERE Allergy_Type.allergytype = "food" INTERSECT SELECT Has_allergy.StuID FROM Has_allergy JOIN Allergy_Type ON Has_allergy.Allergy = Allergy_Type.Allergy WHERE Allergy_Type.allergytype = "animal")

Table allergy_type ( allergy_type.allergy (VARCHAR(20)), allergy_type.allergytype (VARCHAR(20)), ) Table has_allergy ( has_allergy.stuid (INTEGER), has_allergy.allergy (VARCHAR(20)), ) Table student ( student.stuid (INTEGER), student.lname (VARCHAR(12)), student.fname (VARCHAR(12)), student.age (INTEGER), student.sex (VARCHAR(1)), student.major (INTEGER), student.advisor (INTEGER), student.city_code (VARCHAR(3)), ) Possible JOINs: has_allergy.stuid = student.stuid has_allergy.allergy = allergy_type.allergy

{ 'allergy_type': ['allergy', 'allergytype'], 'has_allergy': ['stuid', 'allergy'], 'student': ['stuid', 'lname', 'fname', 'age', 'sex', 'major', 'advisor', 'city_code'] }

{ 'student': ['stuid', 'age'], 'has_allergy': ['stuid', 'allergy'], 'allergy_type': ['allergy', 'allergytype'] }

TABLE Allergy_Type ( Allergy_Type.Allergy (VARCHAR(20)), Allergy_Type.AllergyType (VARCHAR(20)), ) TABLE Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) TABLE Student ( Student.StuID (INTEGER), Student.Age (INTEGER), )

TABLE Allergy_Type ( Allergy_Type.Allergy (VARCHAR(20)), Allergy_Type.AllergyType (VARCHAR(20)), ) TABLE Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) TABLE Student ( Student.StuID (INTEGER), Student.LName (VARCHAR(12)), Student.Fname (VARCHAR(12)), Student.Age (INTEGER), Student.Sex (VARCHAR(1)), Student.Major (INTEGER), Student.Advisor (INTEGER), Student.city_code (VARCHAR(3)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

allergy_1

How old are the students with allergies to food and animal types on average?

hard

Table Allergy_Type ( Allergy_Type.Allergy (VARCHAR(20)), Allergy_Type.AllergyType (VARCHAR(20)), ) Table Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) Table Student ( Student.StuID (INTEGER), Student.LName (VARCHAR(12)), Student.Fname (VARCHAR(12)), Student.Age (INTEGER), Student.Sex (VARCHAR(1)), Student.Major (INTEGER), Student.Advisor (INTEGER), Student.city_code (VARCHAR(3)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

SELECT avg(age) FROM Student WHERE StuID IN ( SELECT Has_allergy.StuID FROM Has_allergy JOIN Allergy_Type ON Has_allergy.Allergy = Allergy_Type.Allergy WHERE Allergy_Type.allergytype = "food" INTERSECT SELECT Has_allergy.StuID FROM Has_allergy JOIN Allergy_Type ON Has_allergy.Allergy = Allergy_Type.Allergy WHERE Allergy_Type.allergytype = "animal")

Table allergy_type ( allergy_type.allergy (VARCHAR(20)), allergy_type.allergytype (VARCHAR(20)), ) Table has_allergy ( has_allergy.stuid (INTEGER), has_allergy.allergy (VARCHAR(20)), ) Table student ( student.stuid (INTEGER), student.lname (VARCHAR(12)), student.fname (VARCHAR(12)), student.age (INTEGER), student.sex (VARCHAR(1)), student.major (INTEGER), student.advisor (INTEGER), student.city_code (VARCHAR(3)), ) Possible JOINs: has_allergy.stuid = student.stuid has_allergy.allergy = allergy_type.allergy

{ 'allergy_type': ['allergy', 'allergytype'], 'has_allergy': ['stuid', 'allergy'], 'student': ['stuid', 'lname', 'fname', 'age', 'sex', 'major', 'advisor', 'city_code'] }

{ 'student': ['stuid', 'age'], 'has_allergy': ['stuid', 'allergy'], 'allergy_type': ['allergy', 'allergytype'] }

TABLE Allergy_Type ( Allergy_Type.Allergy (VARCHAR(20)), Allergy_Type.AllergyType (VARCHAR(20)), ) TABLE Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) TABLE Student ( Student.StuID (INTEGER), Student.Age (INTEGER), )

TABLE Allergy_Type ( Allergy_Type.Allergy (VARCHAR(20)), Allergy_Type.AllergyType (VARCHAR(20)), ) TABLE Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) TABLE Student ( Student.StuID (INTEGER), Student.LName (VARCHAR(12)), Student.Fname (VARCHAR(12)), Student.Age (INTEGER), Student.Sex (VARCHAR(1)), Student.Major (INTEGER), Student.Advisor (INTEGER), Student.city_code (VARCHAR(3)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

allergy_1

List the first and last name of the students who do not have any food type allergy.

extra

Table Allergy_Type ( Allergy_Type.Allergy (VARCHAR(20)), Allergy_Type.AllergyType (VARCHAR(20)), ) Table Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) Table Student ( Student.StuID (INTEGER), Student.LName (VARCHAR(12)), Student.Fname (VARCHAR(12)), Student.Age (INTEGER), Student.Sex (VARCHAR(1)), Student.Major (INTEGER), Student.Advisor (INTEGER), Student.city_code (VARCHAR(3)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

SELECT fname , lname FROM Student WHERE StuID NOT IN (SELECT Has_allergy.StuID FROM Has_allergy JOIN Allergy_Type ON Has_allergy.Allergy = Allergy_Type.Allergy WHERE Allergy_Type.allergytype = "food")

Table allergy_type ( allergy_type.allergy (VARCHAR(20)), allergy_type.allergytype (VARCHAR(20)), ) Table has_allergy ( has_allergy.stuid (INTEGER), has_allergy.allergy (VARCHAR(20)), ) Table student ( student.stuid (INTEGER), student.lname (VARCHAR(12)), student.fname (VARCHAR(12)), student.age (INTEGER), student.sex (VARCHAR(1)), student.major (INTEGER), student.advisor (INTEGER), student.city_code (VARCHAR(3)), ) Possible JOINs: has_allergy.stuid = student.stuid has_allergy.allergy = allergy_type.allergy

{ 'allergy_type': ['allergy', 'allergytype'], 'has_allergy': ['stuid', 'allergy'], 'student': ['stuid', 'lname', 'fname', 'age', 'sex', 'major', 'advisor', 'city_code'] }

{ 'student': ['stuid', 'lname', 'fname'], 'has_allergy': ['stuid', 'allergy'], 'allergy_type': ['allergy', 'allergytype'] }

TABLE Allergy_Type ( Allergy_Type.Allergy (VARCHAR(20)), Allergy_Type.AllergyType (VARCHAR(20)), ) TABLE Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) TABLE Student ( Student.StuID (INTEGER), Student.LName (VARCHAR(12)), Student.Fname (VARCHAR(12)), )

TABLE Allergy_Type ( Allergy_Type.Allergy (VARCHAR(20)), Allergy_Type.AllergyType (VARCHAR(20)), ) TABLE Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) TABLE Student ( Student.StuID (INTEGER), Student.LName (VARCHAR(12)), Student.Fname (VARCHAR(12)), Student.Age (INTEGER), Student.Sex (VARCHAR(1)), Student.Major (INTEGER), Student.Advisor (INTEGER), Student.city_code (VARCHAR(3)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

allergy_1

What is the full name of each student who is not allergic to any type of food.

extra

Table Allergy_Type ( Allergy_Type.Allergy (VARCHAR(20)), Allergy_Type.AllergyType (VARCHAR(20)), ) Table Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) Table Student ( Student.StuID (INTEGER), Student.LName (VARCHAR(12)), Student.Fname (VARCHAR(12)), Student.Age (INTEGER), Student.Sex (VARCHAR(1)), Student.Major (INTEGER), Student.Advisor (INTEGER), Student.city_code (VARCHAR(3)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

SELECT fname , lname FROM Student WHERE StuID NOT IN (SELECT Has_allergy.StuID FROM Has_allergy JOIN Allergy_Type ON Has_allergy.Allergy = Allergy_Type.Allergy WHERE Allergy_Type.allergytype = "food")

Table allergy_type ( allergy_type.allergy (VARCHAR(20)), allergy_type.allergytype (VARCHAR(20)), ) Table has_allergy ( has_allergy.stuid (INTEGER), has_allergy.allergy (VARCHAR(20)), ) Table student ( student.stuid (INTEGER), student.lname (VARCHAR(12)), student.fname (VARCHAR(12)), student.age (INTEGER), student.sex (VARCHAR(1)), student.major (INTEGER), student.advisor (INTEGER), student.city_code (VARCHAR(3)), ) Possible JOINs: has_allergy.stuid = student.stuid has_allergy.allergy = allergy_type.allergy

{ 'allergy_type': ['allergy', 'allergytype'], 'has_allergy': ['stuid', 'allergy'], 'student': ['stuid', 'lname', 'fname', 'age', 'sex', 'major', 'advisor', 'city_code'] }

{ 'student': ['stuid', 'lname', 'fname'], 'has_allergy': ['stuid', 'allergy'], 'allergy_type': ['allergy', 'allergytype'] }

TABLE Allergy_Type ( Allergy_Type.Allergy (VARCHAR(20)), Allergy_Type.AllergyType (VARCHAR(20)), ) TABLE Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) TABLE Student ( Student.StuID (INTEGER), Student.LName (VARCHAR(12)), Student.Fname (VARCHAR(12)), )

TABLE Allergy_Type ( Allergy_Type.Allergy (VARCHAR(20)), Allergy_Type.AllergyType (VARCHAR(20)), ) TABLE Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) TABLE Student ( Student.StuID (INTEGER), Student.LName (VARCHAR(12)), Student.Fname (VARCHAR(12)), Student.Age (INTEGER), Student.Sex (VARCHAR(1)), Student.Major (INTEGER), Student.Advisor (INTEGER), Student.city_code (VARCHAR(3)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

allergy_1

Find the number of male (sex is 'M') students who have some food type allery.

extra

Table Allergy_Type ( Allergy_Type.Allergy (VARCHAR(20)), Allergy_Type.AllergyType (VARCHAR(20)), ) Table Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) Table Student ( Student.StuID (INTEGER), Student.LName (VARCHAR(12)), Student.Fname (VARCHAR(12)), Student.Age (INTEGER), Student.Sex (VARCHAR(1)), Student.Major (INTEGER), Student.Advisor (INTEGER), Student.city_code (VARCHAR(3)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

SELECT count(*) FROM Student WHERE sex = "M" AND StuID IN (SELECT StuID FROM Has_allergy JOIN Allergy_Type ON Has_allergy.Allergy = Allergy_Type.Allergy WHERE Allergy_Type.allergytype = "food")

Table allergy_type ( allergy_type.allergy (VARCHAR(20)), allergy_type.allergytype (VARCHAR(20)), ) Table has_allergy ( has_allergy.stuid (INTEGER), has_allergy.allergy (VARCHAR(20)), ) Table student ( student.stuid (INTEGER), student.lname (VARCHAR(12)), student.fname (VARCHAR(12)), student.age (INTEGER), student.sex (VARCHAR(1)), student.major (INTEGER), student.advisor (INTEGER), student.city_code (VARCHAR(3)), ) Possible JOINs: has_allergy.stuid = student.stuid has_allergy.allergy = allergy_type.allergy

{ 'allergy_type': ['allergy', 'allergytype'], 'has_allergy': ['stuid', 'allergy'], 'student': ['stuid', 'lname', 'fname', 'age', 'sex', 'major', 'advisor', 'city_code'] }

{ 'student': ['stuid', 'sex'], 'has_allergy': ['stuid', 'allergy'], 'allergy_type': ['allergy', 'allergytype'] }

TABLE Allergy_Type ( Allergy_Type.Allergy (VARCHAR(20)), Allergy_Type.AllergyType (VARCHAR(20)), ) TABLE Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) TABLE Student ( Student.StuID (INTEGER), Student.Sex (VARCHAR(1)), )

TABLE Allergy_Type ( Allergy_Type.Allergy (VARCHAR(20)), Allergy_Type.AllergyType (VARCHAR(20)), ) TABLE Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) TABLE Student ( Student.StuID (INTEGER), Student.LName (VARCHAR(12)), Student.Fname (VARCHAR(12)), Student.Age (INTEGER), Student.Sex (VARCHAR(1)), Student.Major (INTEGER), Student.Advisor (INTEGER), Student.city_code (VARCHAR(3)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

allergy_1

How many male students (sex is 'M') are allergic to any type of food?

extra

Table Allergy_Type ( Allergy_Type.Allergy (VARCHAR(20)), Allergy_Type.AllergyType (VARCHAR(20)), ) Table Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) Table Student ( Student.StuID (INTEGER), Student.LName (VARCHAR(12)), Student.Fname (VARCHAR(12)), Student.Age (INTEGER), Student.Sex (VARCHAR(1)), Student.Major (INTEGER), Student.Advisor (INTEGER), Student.city_code (VARCHAR(3)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

SELECT count(*) FROM Student WHERE sex = "M" AND StuID IN (SELECT StuID FROM Has_allergy JOIN Allergy_Type ON Has_allergy.Allergy = Allergy_Type.Allergy WHERE Allergy_Type.allergytype = "food")

Table allergy_type ( allergy_type.allergy (VARCHAR(20)), allergy_type.allergytype (VARCHAR(20)), ) Table has_allergy ( has_allergy.stuid (INTEGER), has_allergy.allergy (VARCHAR(20)), ) Table student ( student.stuid (INTEGER), student.lname (VARCHAR(12)), student.fname (VARCHAR(12)), student.age (INTEGER), student.sex (VARCHAR(1)), student.major (INTEGER), student.advisor (INTEGER), student.city_code (VARCHAR(3)), ) Possible JOINs: has_allergy.stuid = student.stuid has_allergy.allergy = allergy_type.allergy

{ 'allergy_type': ['allergy', 'allergytype'], 'has_allergy': ['stuid', 'allergy'], 'student': ['stuid', 'lname', 'fname', 'age', 'sex', 'major', 'advisor', 'city_code'] }

{ 'student': ['stuid', 'sex'], 'has_allergy': ['stuid', 'allergy'], 'allergy_type': ['allergy', 'allergytype'] }

TABLE Allergy_Type ( Allergy_Type.Allergy (VARCHAR(20)), Allergy_Type.AllergyType (VARCHAR(20)), ) TABLE Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) TABLE Student ( Student.StuID (INTEGER), Student.Sex (VARCHAR(1)), )

TABLE Allergy_Type ( Allergy_Type.Allergy (VARCHAR(20)), Allergy_Type.AllergyType (VARCHAR(20)), ) TABLE Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) TABLE Student ( Student.StuID (INTEGER), Student.LName (VARCHAR(12)), Student.Fname (VARCHAR(12)), Student.Age (INTEGER), Student.Sex (VARCHAR(1)), Student.Major (INTEGER), Student.Advisor (INTEGER), Student.city_code (VARCHAR(3)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

allergy_1

Find the different first names and cities of the students who have allergy to milk or cat.

hard

Table Allergy_Type ( Allergy_Type.Allergy (VARCHAR(20)), Allergy_Type.AllergyType (VARCHAR(20)), ) Table Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) Table Student ( Student.StuID (INTEGER), Student.LName (VARCHAR(12)), Student.Fname (VARCHAR(12)), Student.Age (INTEGER), Student.Sex (VARCHAR(1)), Student.Major (INTEGER), Student.Advisor (INTEGER), Student.city_code (VARCHAR(3)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

SELECT DISTINCT Student.fname , Student.city_code FROM Student JOIN Has_Allergy ON Student.stuid = Has_Allergy.stuid WHERE Has_Allergy.Allergy = "Milk" OR Has_Allergy.Allergy = "Cat"

Table allergy_type ( allergy_type.allergy (VARCHAR(20)), allergy_type.allergytype (VARCHAR(20)), ) Table has_allergy ( has_allergy.stuid (INTEGER), has_allergy.allergy (VARCHAR(20)), ) Table student ( student.stuid (INTEGER), student.lname (VARCHAR(12)), student.fname (VARCHAR(12)), student.age (INTEGER), student.sex (VARCHAR(1)), student.major (INTEGER), student.advisor (INTEGER), student.city_code (VARCHAR(3)), ) Possible JOINs: has_allergy.stuid = student.stuid has_allergy.allergy = allergy_type.allergy

{ 'allergy_type': ['allergy', 'allergytype'], 'has_allergy': ['stuid', 'allergy'], 'student': ['stuid', 'lname', 'fname', 'age', 'sex', 'major', 'advisor', 'city_code'] }

{ 'student': ['stuid', 'fname', 'city_code'], 'has_allergy': ['stuid', 'allergy'] }

TABLE Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) TABLE Student ( Student.StuID (INTEGER), Student.Fname (VARCHAR(12)), Student.city_code (VARCHAR(3)), )

TABLE Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) TABLE Student ( Student.StuID (INTEGER), Student.LName (VARCHAR(12)), Student.Fname (VARCHAR(12)), Student.Age (INTEGER), Student.Sex (VARCHAR(1)), Student.Major (INTEGER), Student.Advisor (INTEGER), Student.city_code (VARCHAR(3)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

allergy_1

What are the distinct first names and cities of the students who have allergy either to milk or to cat?

hard

Table Allergy_Type ( Allergy_Type.Allergy (VARCHAR(20)), Allergy_Type.AllergyType (VARCHAR(20)), ) Table Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) Table Student ( Student.StuID (INTEGER), Student.LName (VARCHAR(12)), Student.Fname (VARCHAR(12)), Student.Age (INTEGER), Student.Sex (VARCHAR(1)), Student.Major (INTEGER), Student.Advisor (INTEGER), Student.city_code (VARCHAR(3)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

SELECT DISTINCT Student.fname , Student.city_code FROM Student JOIN Has_Allergy ON Student.stuid = Has_Allergy.stuid WHERE Has_Allergy.Allergy = "Milk" OR Has_Allergy.Allergy = "Cat"

Table allergy_type ( allergy_type.allergy (VARCHAR(20)), allergy_type.allergytype (VARCHAR(20)), ) Table has_allergy ( has_allergy.stuid (INTEGER), has_allergy.allergy (VARCHAR(20)), ) Table student ( student.stuid (INTEGER), student.lname (VARCHAR(12)), student.fname (VARCHAR(12)), student.age (INTEGER), student.sex (VARCHAR(1)), student.major (INTEGER), student.advisor (INTEGER), student.city_code (VARCHAR(3)), ) Possible JOINs: has_allergy.stuid = student.stuid has_allergy.allergy = allergy_type.allergy

{ 'allergy_type': ['allergy', 'allergytype'], 'has_allergy': ['stuid', 'allergy'], 'student': ['stuid', 'lname', 'fname', 'age', 'sex', 'major', 'advisor', 'city_code'] }

{ 'student': ['stuid', 'fname', 'city_code'], 'has_allergy': ['stuid', 'allergy'] }

TABLE Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) TABLE Student ( Student.StuID (INTEGER), Student.Fname (VARCHAR(12)), Student.city_code (VARCHAR(3)), )

TABLE Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) TABLE Student ( Student.StuID (INTEGER), Student.LName (VARCHAR(12)), Student.Fname (VARCHAR(12)), Student.Age (INTEGER), Student.Sex (VARCHAR(1)), Student.Major (INTEGER), Student.Advisor (INTEGER), Student.city_code (VARCHAR(3)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

allergy_1

Find the number of students who are older than 18 and do not have allergy to either food or animal.

extra

Table Allergy_Type ( Allergy_Type.Allergy (VARCHAR(20)), Allergy_Type.AllergyType (VARCHAR(20)), ) Table Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) Table Student ( Student.StuID (INTEGER), Student.LName (VARCHAR(12)), Student.Fname (VARCHAR(12)), Student.Age (INTEGER), Student.Sex (VARCHAR(1)), Student.Major (INTEGER), Student.Advisor (INTEGER), Student.city_code (VARCHAR(3)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

SELECT count(*) FROM Student WHERE age > 18 AND StuID NOT IN ( SELECT StuID FROM Has_allergy JOIN Allergy_Type ON Has_allergy.Allergy = Allergy_Type.Allergy WHERE Allergy_Type.allergytype = "food" OR Allergy_Type.allergytype = "animal")

Table allergy_type ( allergy_type.allergy (VARCHAR(20)), allergy_type.allergytype (VARCHAR(20)), ) Table has_allergy ( has_allergy.stuid (INTEGER), has_allergy.allergy (VARCHAR(20)), ) Table student ( student.stuid (INTEGER), student.lname (VARCHAR(12)), student.fname (VARCHAR(12)), student.age (INTEGER), student.sex (VARCHAR(1)), student.major (INTEGER), student.advisor (INTEGER), student.city_code (VARCHAR(3)), ) Possible JOINs: has_allergy.stuid = student.stuid has_allergy.allergy = allergy_type.allergy

{ 'allergy_type': ['allergy', 'allergytype'], 'has_allergy': ['stuid', 'allergy'], 'student': ['stuid', 'lname', 'fname', 'age', 'sex', 'major', 'advisor', 'city_code'] }

{ 'student': ['stuid', 'age'], 'has_allergy': ['stuid', 'allergy'], 'allergy_type': ['allergy', 'allergytype'] }

TABLE Allergy_Type ( Allergy_Type.Allergy (VARCHAR(20)), Allergy_Type.AllergyType (VARCHAR(20)), ) TABLE Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) TABLE Student ( Student.StuID (INTEGER), Student.Age (INTEGER), )

TABLE Allergy_Type ( Allergy_Type.Allergy (VARCHAR(20)), Allergy_Type.AllergyType (VARCHAR(20)), ) TABLE Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) TABLE Student ( Student.StuID (INTEGER), Student.LName (VARCHAR(12)), Student.Fname (VARCHAR(12)), Student.Age (INTEGER), Student.Sex (VARCHAR(1)), Student.Major (INTEGER), Student.Advisor (INTEGER), Student.city_code (VARCHAR(3)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

allergy_1

How many students are over 18 and do not have allergy to food type or animal type?

extra

Table Allergy_Type ( Allergy_Type.Allergy (VARCHAR(20)), Allergy_Type.AllergyType (VARCHAR(20)), ) Table Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) Table Student ( Student.StuID (INTEGER), Student.LName (VARCHAR(12)), Student.Fname (VARCHAR(12)), Student.Age (INTEGER), Student.Sex (VARCHAR(1)), Student.Major (INTEGER), Student.Advisor (INTEGER), Student.city_code (VARCHAR(3)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

SELECT count(*) FROM Student WHERE age > 18 AND StuID NOT IN ( SELECT StuID FROM Has_allergy JOIN Allergy_Type ON Has_allergy.Allergy = Allergy_Type.Allergy WHERE Allergy_Type.allergytype = "food" OR Allergy_Type.allergytype = "animal")

Table allergy_type ( allergy_type.allergy (VARCHAR(20)), allergy_type.allergytype (VARCHAR(20)), ) Table has_allergy ( has_allergy.stuid (INTEGER), has_allergy.allergy (VARCHAR(20)), ) Table student ( student.stuid (INTEGER), student.lname (VARCHAR(12)), student.fname (VARCHAR(12)), student.age (INTEGER), student.sex (VARCHAR(1)), student.major (INTEGER), student.advisor (INTEGER), student.city_code (VARCHAR(3)), ) Possible JOINs: has_allergy.stuid = student.stuid has_allergy.allergy = allergy_type.allergy

{ 'allergy_type': ['allergy', 'allergytype'], 'has_allergy': ['stuid', 'allergy'], 'student': ['stuid', 'lname', 'fname', 'age', 'sex', 'major', 'advisor', 'city_code'] }

{ 'student': ['stuid', 'age'], 'has_allergy': ['stuid', 'allergy'], 'allergy_type': ['allergy', 'allergytype'] }

TABLE Allergy_Type ( Allergy_Type.Allergy (VARCHAR(20)), Allergy_Type.AllergyType (VARCHAR(20)), ) TABLE Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) TABLE Student ( Student.StuID (INTEGER), Student.Age (INTEGER), )

TABLE Allergy_Type ( Allergy_Type.Allergy (VARCHAR(20)), Allergy_Type.AllergyType (VARCHAR(20)), ) TABLE Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) TABLE Student ( Student.StuID (INTEGER), Student.LName (VARCHAR(12)), Student.Fname (VARCHAR(12)), Student.Age (INTEGER), Student.Sex (VARCHAR(1)), Student.Major (INTEGER), Student.Advisor (INTEGER), Student.city_code (VARCHAR(3)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

allergy_1

Find the first name and major of the students who are not allegry to soy.

extra

Table Allergy_Type ( Allergy_Type.Allergy (VARCHAR(20)), Allergy_Type.AllergyType (VARCHAR(20)), ) Table Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) Table Student ( Student.StuID (INTEGER), Student.LName (VARCHAR(12)), Student.Fname (VARCHAR(12)), Student.Age (INTEGER), Student.Sex (VARCHAR(1)), Student.Major (INTEGER), Student.Advisor (INTEGER), Student.city_code (VARCHAR(3)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

SELECT fname , major FROM Student WHERE StuID NOT IN (SELECT StuID FROM Has_allergy WHERE Allergy = "Soy")

Table allergy_type ( allergy_type.allergy (VARCHAR(20)), allergy_type.allergytype (VARCHAR(20)), ) Table has_allergy ( has_allergy.stuid (INTEGER), has_allergy.allergy (VARCHAR(20)), ) Table student ( student.stuid (INTEGER), student.lname (VARCHAR(12)), student.fname (VARCHAR(12)), student.age (INTEGER), student.sex (VARCHAR(1)), student.major (INTEGER), student.advisor (INTEGER), student.city_code (VARCHAR(3)), ) Possible JOINs: has_allergy.stuid = student.stuid has_allergy.allergy = allergy_type.allergy

{ 'allergy_type': ['allergy', 'allergytype'], 'has_allergy': ['stuid', 'allergy'], 'student': ['stuid', 'lname', 'fname', 'age', 'sex', 'major', 'advisor', 'city_code'] }

{ 'student': ['stuid', 'fname', 'major'], 'has_allergy': ['stuid', 'allergy'] }

TABLE Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) TABLE Student ( Student.StuID (INTEGER), Student.Fname (VARCHAR(12)), Student.Major (INTEGER), )

TABLE Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) TABLE Student ( Student.StuID (INTEGER), Student.LName (VARCHAR(12)), Student.Fname (VARCHAR(12)), Student.Age (INTEGER), Student.Sex (VARCHAR(1)), Student.Major (INTEGER), Student.Advisor (INTEGER), Student.city_code (VARCHAR(3)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

allergy_1

What are the first name and major of the students who are able to consume soy?

extra

Table Allergy_Type ( Allergy_Type.Allergy (VARCHAR(20)), Allergy_Type.AllergyType (VARCHAR(20)), ) Table Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) Table Student ( Student.StuID (INTEGER), Student.LName (VARCHAR(12)), Student.Fname (VARCHAR(12)), Student.Age (INTEGER), Student.Sex (VARCHAR(1)), Student.Major (INTEGER), Student.Advisor (INTEGER), Student.city_code (VARCHAR(3)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

SELECT fname , major FROM Student WHERE StuID NOT IN (SELECT StuID FROM Has_allergy WHERE Allergy = "Soy")

Table allergy_type ( allergy_type.allergy (VARCHAR(20)), allergy_type.allergytype (VARCHAR(20)), ) Table has_allergy ( has_allergy.stuid (INTEGER), has_allergy.allergy (VARCHAR(20)), ) Table student ( student.stuid (INTEGER), student.lname (VARCHAR(12)), student.fname (VARCHAR(12)), student.age (INTEGER), student.sex (VARCHAR(1)), student.major (INTEGER), student.advisor (INTEGER), student.city_code (VARCHAR(3)), ) Possible JOINs: has_allergy.stuid = student.stuid has_allergy.allergy = allergy_type.allergy

{ 'allergy_type': ['allergy', 'allergytype'], 'has_allergy': ['stuid', 'allergy'], 'student': ['stuid', 'lname', 'fname', 'age', 'sex', 'major', 'advisor', 'city_code'] }

{ 'student': ['stuid', 'fname', 'major'], 'has_allergy': ['stuid', 'allergy'] }

TABLE Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) TABLE Student ( Student.StuID (INTEGER), Student.Fname (VARCHAR(12)), Student.Major (INTEGER), )

TABLE Has_Allergy ( Has_Allergy.StuID (INTEGER), Has_Allergy.Allergy (VARCHAR(20)), ) TABLE Student ( Student.StuID (INTEGER), Student.LName (VARCHAR(12)), Student.Fname (VARCHAR(12)), Student.Age (INTEGER), Student.Sex (VARCHAR(1)), Student.Major (INTEGER), Student.Advisor (INTEGER), Student.city_code (VARCHAR(3)), ) Possible JOINs: Has_Allergy.StuID = Student.StuID Has_Allergy.Allergy = Allergy_Type.Allergy

store_1

A list of the top 5 countries by number of invoices. List country name and number of invoices.

hard

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

SELECT billing_country , COUNT(*) FROM invoices GROUP BY billing_country ORDER BY count(*) DESC LIMIT 5;

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

{ 'artists': ['id', 'name'], 'sqlite_sequence': ['name', 'seq'], 'albums': ['id', 'title', 'artist_id'], 'employees': ['id', 'last_name', 'first_name', 'title', 'reports_to', 'birth_date', 'hire_date', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email'], 'customers': ['id', 'first_name', 'last_name', 'company', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email', 'support_rep_id'], 'genres': ['id', 'name'], 'invoices': ['id', 'customer_id', 'invoice_date', 'billing_address', 'billing_city', 'billing_state', 'billing_country', 'billing_postal_code', 'total'], 'media_types': ['id', 'name'], 'tracks': ['id', 'name', 'album_id', 'media_type_id', 'genre_id', 'composer', 'milliseconds', 'bytes', 'unit_price'], 'invoice_lines': ['id', 'invoice_id', 'track_id', 'unit_price', 'quantity'], 'playlists': ['id', 'name'], 'playlist_tracks': ['playlist_id', 'track_id'] }

{ 'invoices': ['id', 'billing_country'] }

TABLE invoices ( invoices.id (INTEGER), invoices.billing_country (VARCHAR(40)), )

TABLE invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Possible JOINs: invoices.customer_id = customers.id

store_1

What are the top 5 countries by number of invoices and how many do they have?

hard

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

SELECT billing_country , COUNT(*) FROM invoices GROUP BY billing_country ORDER BY count(*) DESC LIMIT 5;

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

{ 'artists': ['id', 'name'], 'sqlite_sequence': ['name', 'seq'], 'albums': ['id', 'title', 'artist_id'], 'employees': ['id', 'last_name', 'first_name', 'title', 'reports_to', 'birth_date', 'hire_date', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email'], 'customers': ['id', 'first_name', 'last_name', 'company', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email', 'support_rep_id'], 'genres': ['id', 'name'], 'invoices': ['id', 'customer_id', 'invoice_date', 'billing_address', 'billing_city', 'billing_state', 'billing_country', 'billing_postal_code', 'total'], 'media_types': ['id', 'name'], 'tracks': ['id', 'name', 'album_id', 'media_type_id', 'genre_id', 'composer', 'milliseconds', 'bytes', 'unit_price'], 'invoice_lines': ['id', 'invoice_id', 'track_id', 'unit_price', 'quantity'], 'playlists': ['id', 'name'], 'playlist_tracks': ['playlist_id', 'track_id'] }

{ 'invoices': ['id', 'billing_country'] }

TABLE invoices ( invoices.id (INTEGER), invoices.billing_country (VARCHAR(40)), )

TABLE invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Possible JOINs: invoices.customer_id = customers.id

store_1

A list of the top 8 countries by gross/total invoice size. List country name and gross invoice size.

hard

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

SELECT billing_country , SUM(total) FROM invoices GROUP BY billing_country ORDER BY SUM(total) DESC LIMIT 8;

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

{ 'artists': ['id', 'name'], 'sqlite_sequence': ['name', 'seq'], 'albums': ['id', 'title', 'artist_id'], 'employees': ['id', 'last_name', 'first_name', 'title', 'reports_to', 'birth_date', 'hire_date', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email'], 'customers': ['id', 'first_name', 'last_name', 'company', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email', 'support_rep_id'], 'genres': ['id', 'name'], 'invoices': ['id', 'customer_id', 'invoice_date', 'billing_address', 'billing_city', 'billing_state', 'billing_country', 'billing_postal_code', 'total'], 'media_types': ['id', 'name'], 'tracks': ['id', 'name', 'album_id', 'media_type_id', 'genre_id', 'composer', 'milliseconds', 'bytes', 'unit_price'], 'invoice_lines': ['id', 'invoice_id', 'track_id', 'unit_price', 'quantity'], 'playlists': ['id', 'name'], 'playlist_tracks': ['playlist_id', 'track_id'] }

{ 'invoices': ['id', 'billing_country', 'total'] }

TABLE invoices ( invoices.id (INTEGER), invoices.billing_country (VARCHAR(40)), invoices.total (NUMERIC(10,2)), )

TABLE invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Possible JOINs: invoices.customer_id = customers.id

store_1

What are the names of the top 8 countries by total invoice size and what are those sizes?

hard

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

SELECT billing_country , SUM(total) FROM invoices GROUP BY billing_country ORDER BY SUM(total) DESC LIMIT 8;

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

{ 'artists': ['id', 'name'], 'sqlite_sequence': ['name', 'seq'], 'albums': ['id', 'title', 'artist_id'], 'employees': ['id', 'last_name', 'first_name', 'title', 'reports_to', 'birth_date', 'hire_date', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email'], 'customers': ['id', 'first_name', 'last_name', 'company', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email', 'support_rep_id'], 'genres': ['id', 'name'], 'invoices': ['id', 'customer_id', 'invoice_date', 'billing_address', 'billing_city', 'billing_state', 'billing_country', 'billing_postal_code', 'total'], 'media_types': ['id', 'name'], 'tracks': ['id', 'name', 'album_id', 'media_type_id', 'genre_id', 'composer', 'milliseconds', 'bytes', 'unit_price'], 'invoice_lines': ['id', 'invoice_id', 'track_id', 'unit_price', 'quantity'], 'playlists': ['id', 'name'], 'playlist_tracks': ['playlist_id', 'track_id'] }

{ 'invoices': ['id', 'billing_country', 'total'] }

TABLE invoices ( invoices.id (INTEGER), invoices.billing_country (VARCHAR(40)), invoices.total (NUMERIC(10,2)), )

TABLE invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Possible JOINs: invoices.customer_id = customers.id

store_1

A list of the top 10 countries by average invoice size. List country name and average invoice size.

hard

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

SELECT billing_country , AVG(total) FROM invoices GROUP BY billing_country ORDER BY AVG(total) DESC LIMIT 10;

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

{ 'artists': ['id', 'name'], 'sqlite_sequence': ['name', 'seq'], 'albums': ['id', 'title', 'artist_id'], 'employees': ['id', 'last_name', 'first_name', 'title', 'reports_to', 'birth_date', 'hire_date', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email'], 'customers': ['id', 'first_name', 'last_name', 'company', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email', 'support_rep_id'], 'genres': ['id', 'name'], 'invoices': ['id', 'customer_id', 'invoice_date', 'billing_address', 'billing_city', 'billing_state', 'billing_country', 'billing_postal_code', 'total'], 'media_types': ['id', 'name'], 'tracks': ['id', 'name', 'album_id', 'media_type_id', 'genre_id', 'composer', 'milliseconds', 'bytes', 'unit_price'], 'invoice_lines': ['id', 'invoice_id', 'track_id', 'unit_price', 'quantity'], 'playlists': ['id', 'name'], 'playlist_tracks': ['playlist_id', 'track_id'] }

{ 'invoices': ['id', 'billing_country', 'total'] }

TABLE invoices ( invoices.id (INTEGER), invoices.billing_country (VARCHAR(40)), invoices.total (NUMERIC(10,2)), )

TABLE invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Possible JOINs: invoices.customer_id = customers.id

store_1

What are the names of the countries and average invoice size of the top countries by size?

hard

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

SELECT billing_country , AVG(total) FROM invoices GROUP BY billing_country ORDER BY AVG(total) DESC LIMIT 10;

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

{ 'artists': ['id', 'name'], 'sqlite_sequence': ['name', 'seq'], 'albums': ['id', 'title', 'artist_id'], 'employees': ['id', 'last_name', 'first_name', 'title', 'reports_to', 'birth_date', 'hire_date', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email'], 'customers': ['id', 'first_name', 'last_name', 'company', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email', 'support_rep_id'], 'genres': ['id', 'name'], 'invoices': ['id', 'customer_id', 'invoice_date', 'billing_address', 'billing_city', 'billing_state', 'billing_country', 'billing_postal_code', 'total'], 'media_types': ['id', 'name'], 'tracks': ['id', 'name', 'album_id', 'media_type_id', 'genre_id', 'composer', 'milliseconds', 'bytes', 'unit_price'], 'invoice_lines': ['id', 'invoice_id', 'track_id', 'unit_price', 'quantity'], 'playlists': ['id', 'name'], 'playlist_tracks': ['playlist_id', 'track_id'] }

{ 'invoices': ['id', 'billing_country', 'total'] }

TABLE invoices ( invoices.id (INTEGER), invoices.billing_country (VARCHAR(40)), invoices.total (NUMERIC(10,2)), )

TABLE invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Possible JOINs: invoices.customer_id = customers.id

store_1

Find out 5 customers who most recently purchased something. List customers' first and last name.

hard

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

SELECT customers.first_name , customers.last_name FROM customers JOIN invoices ON invoices.customer_id = customers.id ORDER BY invoices.invoice_date DESC LIMIT 5;

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

{ 'artists': ['id', 'name'], 'sqlite_sequence': ['name', 'seq'], 'albums': ['id', 'title', 'artist_id'], 'employees': ['id', 'last_name', 'first_name', 'title', 'reports_to', 'birth_date', 'hire_date', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email'], 'customers': ['id', 'first_name', 'last_name', 'company', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email', 'support_rep_id'], 'genres': ['id', 'name'], 'invoices': ['id', 'customer_id', 'invoice_date', 'billing_address', 'billing_city', 'billing_state', 'billing_country', 'billing_postal_code', 'total'], 'media_types': ['id', 'name'], 'tracks': ['id', 'name', 'album_id', 'media_type_id', 'genre_id', 'composer', 'milliseconds', 'bytes', 'unit_price'], 'invoice_lines': ['id', 'invoice_id', 'track_id', 'unit_price', 'quantity'], 'playlists': ['id', 'name'], 'playlist_tracks': ['playlist_id', 'track_id'] }

{ 'customers': ['id', 'first_name', 'last_name'], 'invoices': ['id', 'customer_id', 'invoice_date'] }

TABLE customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), ) TABLE invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), ) Possible JOINs: invoices.customer_id = customers.id

TABLE customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) TABLE invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Possible JOINs: customers.support_rep_id = employees.id invoices.customer_id = customers.id

store_1

What are the first and last names of the 5 customers who purchased something most recently?

hard

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

SELECT customers.first_name , customers.last_name FROM customers JOIN invoices ON invoices.customer_id = customers.id ORDER BY invoices.invoice_date DESC LIMIT 5;

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

{ 'artists': ['id', 'name'], 'sqlite_sequence': ['name', 'seq'], 'albums': ['id', 'title', 'artist_id'], 'employees': ['id', 'last_name', 'first_name', 'title', 'reports_to', 'birth_date', 'hire_date', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email'], 'customers': ['id', 'first_name', 'last_name', 'company', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email', 'support_rep_id'], 'genres': ['id', 'name'], 'invoices': ['id', 'customer_id', 'invoice_date', 'billing_address', 'billing_city', 'billing_state', 'billing_country', 'billing_postal_code', 'total'], 'media_types': ['id', 'name'], 'tracks': ['id', 'name', 'album_id', 'media_type_id', 'genre_id', 'composer', 'milliseconds', 'bytes', 'unit_price'], 'invoice_lines': ['id', 'invoice_id', 'track_id', 'unit_price', 'quantity'], 'playlists': ['id', 'name'], 'playlist_tracks': ['playlist_id', 'track_id'] }

{ 'customers': ['id', 'first_name', 'last_name'], 'invoices': ['id', 'customer_id', 'invoice_date'] }

TABLE customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), ) TABLE invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), ) Possible JOINs: invoices.customer_id = customers.id

TABLE customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) TABLE invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Possible JOINs: customers.support_rep_id = employees.id invoices.customer_id = customers.id

store_1

Find out the top 10 customers by total number of orders. List customers' first and last name and the number of total orders.

extra

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

SELECT customers.first_name , customers.last_name , COUNT(*) FROM customers JOIN invoices ON invoices.customer_id = customers.id GROUP BY customers.id ORDER BY COUNT(*) DESC LIMIT 10;

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

{ 'artists': ['id', 'name'], 'sqlite_sequence': ['name', 'seq'], 'albums': ['id', 'title', 'artist_id'], 'employees': ['id', 'last_name', 'first_name', 'title', 'reports_to', 'birth_date', 'hire_date', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email'], 'customers': ['id', 'first_name', 'last_name', 'company', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email', 'support_rep_id'], 'genres': ['id', 'name'], 'invoices': ['id', 'customer_id', 'invoice_date', 'billing_address', 'billing_city', 'billing_state', 'billing_country', 'billing_postal_code', 'total'], 'media_types': ['id', 'name'], 'tracks': ['id', 'name', 'album_id', 'media_type_id', 'genre_id', 'composer', 'milliseconds', 'bytes', 'unit_price'], 'invoice_lines': ['id', 'invoice_id', 'track_id', 'unit_price', 'quantity'], 'playlists': ['id', 'name'], 'playlist_tracks': ['playlist_id', 'track_id'] }

{ 'customers': ['id', 'first_name', 'last_name'], 'invoices': ['id', 'customer_id'] }

TABLE customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), ) TABLE invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), ) Possible JOINs: invoices.customer_id = customers.id

TABLE customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) TABLE invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Possible JOINs: customers.support_rep_id = employees.id invoices.customer_id = customers.id

store_1

What are the top 10 customers' first and last names by total number of orders and how many orders did they make?

extra

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

SELECT customers.first_name , customers.last_name , COUNT(*) FROM customers JOIN invoices ON invoices.customer_id = customers.id GROUP BY customers.id ORDER BY COUNT(*) DESC LIMIT 10;

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

{ 'artists': ['id', 'name'], 'sqlite_sequence': ['name', 'seq'], 'albums': ['id', 'title', 'artist_id'], 'employees': ['id', 'last_name', 'first_name', 'title', 'reports_to', 'birth_date', 'hire_date', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email'], 'customers': ['id', 'first_name', 'last_name', 'company', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email', 'support_rep_id'], 'genres': ['id', 'name'], 'invoices': ['id', 'customer_id', 'invoice_date', 'billing_address', 'billing_city', 'billing_state', 'billing_country', 'billing_postal_code', 'total'], 'media_types': ['id', 'name'], 'tracks': ['id', 'name', 'album_id', 'media_type_id', 'genre_id', 'composer', 'milliseconds', 'bytes', 'unit_price'], 'invoice_lines': ['id', 'invoice_id', 'track_id', 'unit_price', 'quantity'], 'playlists': ['id', 'name'], 'playlist_tracks': ['playlist_id', 'track_id'] }

{ 'customers': ['id', 'first_name', 'last_name'], 'invoices': ['id', 'customer_id'] }

TABLE customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), ) TABLE invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), ) Possible JOINs: invoices.customer_id = customers.id

TABLE customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) TABLE invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Possible JOINs: customers.support_rep_id = employees.id invoices.customer_id = customers.id

store_1

List the top 10 customers by total gross sales. List customers' first and last name and total gross sales.

extra

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

SELECT customers.first_name , customers.last_name , SUM(invoices.total) FROM customers JOIN invoices ON invoices.customer_id = customers.id GROUP BY customers.id ORDER BY SUM(invoices.total) DESC LIMIT 10;

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

{ 'artists': ['id', 'name'], 'sqlite_sequence': ['name', 'seq'], 'albums': ['id', 'title', 'artist_id'], 'employees': ['id', 'last_name', 'first_name', 'title', 'reports_to', 'birth_date', 'hire_date', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email'], 'customers': ['id', 'first_name', 'last_name', 'company', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email', 'support_rep_id'], 'genres': ['id', 'name'], 'invoices': ['id', 'customer_id', 'invoice_date', 'billing_address', 'billing_city', 'billing_state', 'billing_country', 'billing_postal_code', 'total'], 'media_types': ['id', 'name'], 'tracks': ['id', 'name', 'album_id', 'media_type_id', 'genre_id', 'composer', 'milliseconds', 'bytes', 'unit_price'], 'invoice_lines': ['id', 'invoice_id', 'track_id', 'unit_price', 'quantity'], 'playlists': ['id', 'name'], 'playlist_tracks': ['playlist_id', 'track_id'] }

{ 'customers': ['id', 'first_name', 'last_name'], 'invoices': ['id', 'customer_id', 'total'] }

TABLE customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), ) TABLE invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.total (NUMERIC(10,2)), ) Possible JOINs: invoices.customer_id = customers.id

TABLE customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) TABLE invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Possible JOINs: customers.support_rep_id = employees.id invoices.customer_id = customers.id

store_1

What are the top 10 customers' first and last names with the highest gross sales, and also what are the sales?

extra

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

SELECT customers.first_name , customers.last_name , SUM(invoices.total) FROM customers JOIN invoices ON invoices.customer_id = customers.id GROUP BY customers.id ORDER BY SUM(invoices.total) DESC LIMIT 10;

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

{ 'artists': ['id', 'name'], 'sqlite_sequence': ['name', 'seq'], 'albums': ['id', 'title', 'artist_id'], 'employees': ['id', 'last_name', 'first_name', 'title', 'reports_to', 'birth_date', 'hire_date', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email'], 'customers': ['id', 'first_name', 'last_name', 'company', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email', 'support_rep_id'], 'genres': ['id', 'name'], 'invoices': ['id', 'customer_id', 'invoice_date', 'billing_address', 'billing_city', 'billing_state', 'billing_country', 'billing_postal_code', 'total'], 'media_types': ['id', 'name'], 'tracks': ['id', 'name', 'album_id', 'media_type_id', 'genre_id', 'composer', 'milliseconds', 'bytes', 'unit_price'], 'invoice_lines': ['id', 'invoice_id', 'track_id', 'unit_price', 'quantity'], 'playlists': ['id', 'name'], 'playlist_tracks': ['playlist_id', 'track_id'] }

{ 'customers': ['id', 'first_name', 'last_name'], 'invoices': ['id', 'customer_id', 'total'] }

TABLE customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), ) TABLE invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.total (NUMERIC(10,2)), ) Possible JOINs: invoices.customer_id = customers.id

TABLE customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) TABLE invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Possible JOINs: customers.support_rep_id = employees.id invoices.customer_id = customers.id

store_1

List the top 5 genres by number of tracks. List genres name and total tracks.

extra

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

SELECT genres.name , COUNT(*) FROM genres JOIN tracks ON tracks.genre_id = genres.id GROUP BY genres.id ORDER BY count(*) DESC LIMIT 5;

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

{ 'artists': ['id', 'name'], 'sqlite_sequence': ['name', 'seq'], 'albums': ['id', 'title', 'artist_id'], 'employees': ['id', 'last_name', 'first_name', 'title', 'reports_to', 'birth_date', 'hire_date', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email'], 'customers': ['id', 'first_name', 'last_name', 'company', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email', 'support_rep_id'], 'genres': ['id', 'name'], 'invoices': ['id', 'customer_id', 'invoice_date', 'billing_address', 'billing_city', 'billing_state', 'billing_country', 'billing_postal_code', 'total'], 'media_types': ['id', 'name'], 'tracks': ['id', 'name', 'album_id', 'media_type_id', 'genre_id', 'composer', 'milliseconds', 'bytes', 'unit_price'], 'invoice_lines': ['id', 'invoice_id', 'track_id', 'unit_price', 'quantity'], 'playlists': ['id', 'name'], 'playlist_tracks': ['playlist_id', 'track_id'] }

{ 'genres': ['id', 'name'], 'tracks': ['id', 'genre_id'] }

TABLE genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) TABLE tracks ( tracks.id (INTEGER), tracks.genre_id (INTEGER), ) Possible JOINs: tracks.genre_id = genres.id

TABLE genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) TABLE tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

store_1

How many tracks does each genre have and what are the names of the top 5?

extra

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

SELECT genres.name , COUNT(*) FROM genres JOIN tracks ON tracks.genre_id = genres.id GROUP BY genres.id ORDER BY count(*) DESC LIMIT 5;

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

{ 'artists': ['id', 'name'], 'sqlite_sequence': ['name', 'seq'], 'albums': ['id', 'title', 'artist_id'], 'employees': ['id', 'last_name', 'first_name', 'title', 'reports_to', 'birth_date', 'hire_date', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email'], 'customers': ['id', 'first_name', 'last_name', 'company', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email', 'support_rep_id'], 'genres': ['id', 'name'], 'invoices': ['id', 'customer_id', 'invoice_date', 'billing_address', 'billing_city', 'billing_state', 'billing_country', 'billing_postal_code', 'total'], 'media_types': ['id', 'name'], 'tracks': ['id', 'name', 'album_id', 'media_type_id', 'genre_id', 'composer', 'milliseconds', 'bytes', 'unit_price'], 'invoice_lines': ['id', 'invoice_id', 'track_id', 'unit_price', 'quantity'], 'playlists': ['id', 'name'], 'playlist_tracks': ['playlist_id', 'track_id'] }

{ 'genres': ['id', 'name'], 'tracks': ['id', 'genre_id'] }

TABLE genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) TABLE tracks ( tracks.id (INTEGER), tracks.genre_id (INTEGER), ) Possible JOINs: tracks.genre_id = genres.id

TABLE genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) TABLE tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

store_1

List every album's title.

easy

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

SELECT title FROM albums;

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

{ 'artists': ['id', 'name'], 'sqlite_sequence': ['name', 'seq'], 'albums': ['id', 'title', 'artist_id'], 'employees': ['id', 'last_name', 'first_name', 'title', 'reports_to', 'birth_date', 'hire_date', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email'], 'customers': ['id', 'first_name', 'last_name', 'company', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email', 'support_rep_id'], 'genres': ['id', 'name'], 'invoices': ['id', 'customer_id', 'invoice_date', 'billing_address', 'billing_city', 'billing_state', 'billing_country', 'billing_postal_code', 'total'], 'media_types': ['id', 'name'], 'tracks': ['id', 'name', 'album_id', 'media_type_id', 'genre_id', 'composer', 'milliseconds', 'bytes', 'unit_price'], 'invoice_lines': ['id', 'invoice_id', 'track_id', 'unit_price', 'quantity'], 'playlists': ['id', 'name'], 'playlist_tracks': ['playlist_id', 'track_id'] }

{ 'albums': ['id', 'title'] }

TABLE albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), )

TABLE albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Possible JOINs: albums.artist_id = artists.id

store_1

What are the titles of all the albums?

easy

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

SELECT title FROM albums;

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

{ 'artists': ['id', 'name'], 'sqlite_sequence': ['name', 'seq'], 'albums': ['id', 'title', 'artist_id'], 'employees': ['id', 'last_name', 'first_name', 'title', 'reports_to', 'birth_date', 'hire_date', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email'], 'customers': ['id', 'first_name', 'last_name', 'company', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email', 'support_rep_id'], 'genres': ['id', 'name'], 'invoices': ['id', 'customer_id', 'invoice_date', 'billing_address', 'billing_city', 'billing_state', 'billing_country', 'billing_postal_code', 'total'], 'media_types': ['id', 'name'], 'tracks': ['id', 'name', 'album_id', 'media_type_id', 'genre_id', 'composer', 'milliseconds', 'bytes', 'unit_price'], 'invoice_lines': ['id', 'invoice_id', 'track_id', 'unit_price', 'quantity'], 'playlists': ['id', 'name'], 'playlist_tracks': ['playlist_id', 'track_id'] }

{ 'albums': ['id', 'title'] }

TABLE albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), )

TABLE albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Possible JOINs: albums.artist_id = artists.id

store_1

List every album ordered by album title in ascending order.

easy

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

SELECT title FROM albums ORDER BY title;

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

{ 'artists': ['id', 'name'], 'sqlite_sequence': ['name', 'seq'], 'albums': ['id', 'title', 'artist_id'], 'employees': ['id', 'last_name', 'first_name', 'title', 'reports_to', 'birth_date', 'hire_date', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email'], 'customers': ['id', 'first_name', 'last_name', 'company', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email', 'support_rep_id'], 'genres': ['id', 'name'], 'invoices': ['id', 'customer_id', 'invoice_date', 'billing_address', 'billing_city', 'billing_state', 'billing_country', 'billing_postal_code', 'total'], 'media_types': ['id', 'name'], 'tracks': ['id', 'name', 'album_id', 'media_type_id', 'genre_id', 'composer', 'milliseconds', 'bytes', 'unit_price'], 'invoice_lines': ['id', 'invoice_id', 'track_id', 'unit_price', 'quantity'], 'playlists': ['id', 'name'], 'playlist_tracks': ['playlist_id', 'track_id'] }

{ 'albums': ['id', 'title'] }

TABLE albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), )

TABLE albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Possible JOINs: albums.artist_id = artists.id

store_1

What are the titles of all the albums alphabetically ascending?

easy

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

SELECT title FROM albums ORDER BY title;

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

{ 'artists': ['id', 'name'], 'sqlite_sequence': ['name', 'seq'], 'albums': ['id', 'title', 'artist_id'], 'employees': ['id', 'last_name', 'first_name', 'title', 'reports_to', 'birth_date', 'hire_date', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email'], 'customers': ['id', 'first_name', 'last_name', 'company', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email', 'support_rep_id'], 'genres': ['id', 'name'], 'invoices': ['id', 'customer_id', 'invoice_date', 'billing_address', 'billing_city', 'billing_state', 'billing_country', 'billing_postal_code', 'total'], 'media_types': ['id', 'name'], 'tracks': ['id', 'name', 'album_id', 'media_type_id', 'genre_id', 'composer', 'milliseconds', 'bytes', 'unit_price'], 'invoice_lines': ['id', 'invoice_id', 'track_id', 'unit_price', 'quantity'], 'playlists': ['id', 'name'], 'playlist_tracks': ['playlist_id', 'track_id'] }

{ 'albums': ['id', 'title'] }

TABLE albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), )

TABLE albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Possible JOINs: albums.artist_id = artists.id

store_1

List every album whose title starts with A in alphabetical order.

hard

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

SELECT title FROM albums WHERE title LIKE 'A%' ORDER BY title;

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

{ 'artists': ['id', 'name'], 'sqlite_sequence': ['name', 'seq'], 'albums': ['id', 'title', 'artist_id'], 'employees': ['id', 'last_name', 'first_name', 'title', 'reports_to', 'birth_date', 'hire_date', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email'], 'customers': ['id', 'first_name', 'last_name', 'company', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email', 'support_rep_id'], 'genres': ['id', 'name'], 'invoices': ['id', 'customer_id', 'invoice_date', 'billing_address', 'billing_city', 'billing_state', 'billing_country', 'billing_postal_code', 'total'], 'media_types': ['id', 'name'], 'tracks': ['id', 'name', 'album_id', 'media_type_id', 'genre_id', 'composer', 'milliseconds', 'bytes', 'unit_price'], 'invoice_lines': ['id', 'invoice_id', 'track_id', 'unit_price', 'quantity'], 'playlists': ['id', 'name'], 'playlist_tracks': ['playlist_id', 'track_id'] }

{ 'albums': ['id', 'title'] }

TABLE albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), )

TABLE albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Possible JOINs: albums.artist_id = artists.id

store_1

What are the titles of all albums that start with A in alphabetical order?

hard

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

SELECT title FROM albums WHERE title LIKE 'A%' ORDER BY title;

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

{ 'artists': ['id', 'name'], 'sqlite_sequence': ['name', 'seq'], 'albums': ['id', 'title', 'artist_id'], 'employees': ['id', 'last_name', 'first_name', 'title', 'reports_to', 'birth_date', 'hire_date', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email'], 'customers': ['id', 'first_name', 'last_name', 'company', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email', 'support_rep_id'], 'genres': ['id', 'name'], 'invoices': ['id', 'customer_id', 'invoice_date', 'billing_address', 'billing_city', 'billing_state', 'billing_country', 'billing_postal_code', 'total'], 'media_types': ['id', 'name'], 'tracks': ['id', 'name', 'album_id', 'media_type_id', 'genre_id', 'composer', 'milliseconds', 'bytes', 'unit_price'], 'invoice_lines': ['id', 'invoice_id', 'track_id', 'unit_price', 'quantity'], 'playlists': ['id', 'name'], 'playlist_tracks': ['playlist_id', 'track_id'] }

{ 'albums': ['id', 'title'] }

TABLE albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), )

TABLE albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Possible JOINs: albums.artist_id = artists.id

store_1

List the customers first and last name of 10 least expensive invoices.

hard

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

SELECT customers.first_name , customers.last_name FROM customers JOIN invoices ON invoices.customer_id = customers.id ORDER BY total LIMIT 10;

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

{ 'artists': ['id', 'name'], 'sqlite_sequence': ['name', 'seq'], 'albums': ['id', 'title', 'artist_id'], 'employees': ['id', 'last_name', 'first_name', 'title', 'reports_to', 'birth_date', 'hire_date', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email'], 'customers': ['id', 'first_name', 'last_name', 'company', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email', 'support_rep_id'], 'genres': ['id', 'name'], 'invoices': ['id', 'customer_id', 'invoice_date', 'billing_address', 'billing_city', 'billing_state', 'billing_country', 'billing_postal_code', 'total'], 'media_types': ['id', 'name'], 'tracks': ['id', 'name', 'album_id', 'media_type_id', 'genre_id', 'composer', 'milliseconds', 'bytes', 'unit_price'], 'invoice_lines': ['id', 'invoice_id', 'track_id', 'unit_price', 'quantity'], 'playlists': ['id', 'name'], 'playlist_tracks': ['playlist_id', 'track_id'] }

{ 'customers': ['id', 'first_name', 'last_name'], 'invoices': ['id', 'customer_id', 'total'] }

TABLE customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), ) TABLE invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.total (NUMERIC(10,2)), ) Possible JOINs: invoices.customer_id = customers.id

TABLE customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) TABLE invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Possible JOINs: customers.support_rep_id = employees.id invoices.customer_id = customers.id

store_1

What are the first and last names of the customers with the 10 cheapest invoices?

hard

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

SELECT customers.first_name , customers.last_name FROM customers JOIN invoices ON invoices.customer_id = customers.id ORDER BY total LIMIT 10;

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

{ 'artists': ['id', 'name'], 'sqlite_sequence': ['name', 'seq'], 'albums': ['id', 'title', 'artist_id'], 'employees': ['id', 'last_name', 'first_name', 'title', 'reports_to', 'birth_date', 'hire_date', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email'], 'customers': ['id', 'first_name', 'last_name', 'company', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email', 'support_rep_id'], 'genres': ['id', 'name'], 'invoices': ['id', 'customer_id', 'invoice_date', 'billing_address', 'billing_city', 'billing_state', 'billing_country', 'billing_postal_code', 'total'], 'media_types': ['id', 'name'], 'tracks': ['id', 'name', 'album_id', 'media_type_id', 'genre_id', 'composer', 'milliseconds', 'bytes', 'unit_price'], 'invoice_lines': ['id', 'invoice_id', 'track_id', 'unit_price', 'quantity'], 'playlists': ['id', 'name'], 'playlist_tracks': ['playlist_id', 'track_id'] }

{ 'customers': ['id', 'first_name', 'last_name'], 'invoices': ['id', 'customer_id', 'total'] }

TABLE customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), ) TABLE invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.total (NUMERIC(10,2)), ) Possible JOINs: invoices.customer_id = customers.id

TABLE customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) TABLE invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Possible JOINs: customers.support_rep_id = employees.id invoices.customer_id = customers.id

store_1

List total amount of invoice from Chicago, IL.

medium

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

SELECT sum(total) FROM invoices WHERE billing_city = "Chicago" AND billing_state = "IL";

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

{ 'artists': ['id', 'name'], 'sqlite_sequence': ['name', 'seq'], 'albums': ['id', 'title', 'artist_id'], 'employees': ['id', 'last_name', 'first_name', 'title', 'reports_to', 'birth_date', 'hire_date', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email'], 'customers': ['id', 'first_name', 'last_name', 'company', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email', 'support_rep_id'], 'genres': ['id', 'name'], 'invoices': ['id', 'customer_id', 'invoice_date', 'billing_address', 'billing_city', 'billing_state', 'billing_country', 'billing_postal_code', 'total'], 'media_types': ['id', 'name'], 'tracks': ['id', 'name', 'album_id', 'media_type_id', 'genre_id', 'composer', 'milliseconds', 'bytes', 'unit_price'], 'invoice_lines': ['id', 'invoice_id', 'track_id', 'unit_price', 'quantity'], 'playlists': ['id', 'name'], 'playlist_tracks': ['playlist_id', 'track_id'] }

{ 'invoices': ['id', 'billing_city', 'billing_state', 'total'] }

TABLE invoices ( invoices.id (INTEGER), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.total (NUMERIC(10,2)), )

TABLE invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Possible JOINs: invoices.customer_id = customers.id

store_1

What are the total amount of money in the invoices billed from Chicago, Illinois?

medium

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

SELECT sum(total) FROM invoices WHERE billing_city = "Chicago" AND billing_state = "IL";

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

{ 'artists': ['id', 'name'], 'sqlite_sequence': ['name', 'seq'], 'albums': ['id', 'title', 'artist_id'], 'employees': ['id', 'last_name', 'first_name', 'title', 'reports_to', 'birth_date', 'hire_date', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email'], 'customers': ['id', 'first_name', 'last_name', 'company', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email', 'support_rep_id'], 'genres': ['id', 'name'], 'invoices': ['id', 'customer_id', 'invoice_date', 'billing_address', 'billing_city', 'billing_state', 'billing_country', 'billing_postal_code', 'total'], 'media_types': ['id', 'name'], 'tracks': ['id', 'name', 'album_id', 'media_type_id', 'genre_id', 'composer', 'milliseconds', 'bytes', 'unit_price'], 'invoice_lines': ['id', 'invoice_id', 'track_id', 'unit_price', 'quantity'], 'playlists': ['id', 'name'], 'playlist_tracks': ['playlist_id', 'track_id'] }

{ 'invoices': ['id', 'billing_city', 'billing_state', 'total'] }

TABLE invoices ( invoices.id (INTEGER), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.total (NUMERIC(10,2)), )

TABLE invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Possible JOINs: invoices.customer_id = customers.id

store_1

List the number of invoices from Chicago, IL.

medium

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

SELECT COUNT(*) FROM invoices WHERE billing_city = "Chicago" AND billing_state = "IL";

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

{ 'artists': ['id', 'name'], 'sqlite_sequence': ['name', 'seq'], 'albums': ['id', 'title', 'artist_id'], 'employees': ['id', 'last_name', 'first_name', 'title', 'reports_to', 'birth_date', 'hire_date', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email'], 'customers': ['id', 'first_name', 'last_name', 'company', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email', 'support_rep_id'], 'genres': ['id', 'name'], 'invoices': ['id', 'customer_id', 'invoice_date', 'billing_address', 'billing_city', 'billing_state', 'billing_country', 'billing_postal_code', 'total'], 'media_types': ['id', 'name'], 'tracks': ['id', 'name', 'album_id', 'media_type_id', 'genre_id', 'composer', 'milliseconds', 'bytes', 'unit_price'], 'invoice_lines': ['id', 'invoice_id', 'track_id', 'unit_price', 'quantity'], 'playlists': ['id', 'name'], 'playlist_tracks': ['playlist_id', 'track_id'] }

{ 'invoices': ['id', 'billing_city', 'billing_state'] }

TABLE invoices ( invoices.id (INTEGER), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), )

TABLE invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Possible JOINs: invoices.customer_id = customers.id

store_1

How many invoices were billed from Chicago, IL?

medium

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

SELECT COUNT(*) FROM invoices WHERE billing_city = "Chicago" AND billing_state = "IL";

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

{ 'artists': ['id', 'name'], 'sqlite_sequence': ['name', 'seq'], 'albums': ['id', 'title', 'artist_id'], 'employees': ['id', 'last_name', 'first_name', 'title', 'reports_to', 'birth_date', 'hire_date', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email'], 'customers': ['id', 'first_name', 'last_name', 'company', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email', 'support_rep_id'], 'genres': ['id', 'name'], 'invoices': ['id', 'customer_id', 'invoice_date', 'billing_address', 'billing_city', 'billing_state', 'billing_country', 'billing_postal_code', 'total'], 'media_types': ['id', 'name'], 'tracks': ['id', 'name', 'album_id', 'media_type_id', 'genre_id', 'composer', 'milliseconds', 'bytes', 'unit_price'], 'invoice_lines': ['id', 'invoice_id', 'track_id', 'unit_price', 'quantity'], 'playlists': ['id', 'name'], 'playlist_tracks': ['playlist_id', 'track_id'] }

{ 'invoices': ['id', 'billing_city', 'billing_state'] }

TABLE invoices ( invoices.id (INTEGER), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), )

TABLE invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Possible JOINs: invoices.customer_id = customers.id

store_1

List the number of invoices from the US, grouped by state.

medium

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

SELECT billing_state , COUNT(*) FROM invoices WHERE billing_country = "USA" GROUP BY billing_state;

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

{ 'artists': ['id', 'name'], 'sqlite_sequence': ['name', 'seq'], 'albums': ['id', 'title', 'artist_id'], 'employees': ['id', 'last_name', 'first_name', 'title', 'reports_to', 'birth_date', 'hire_date', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email'], 'customers': ['id', 'first_name', 'last_name', 'company', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email', 'support_rep_id'], 'genres': ['id', 'name'], 'invoices': ['id', 'customer_id', 'invoice_date', 'billing_address', 'billing_city', 'billing_state', 'billing_country', 'billing_postal_code', 'total'], 'media_types': ['id', 'name'], 'tracks': ['id', 'name', 'album_id', 'media_type_id', 'genre_id', 'composer', 'milliseconds', 'bytes', 'unit_price'], 'invoice_lines': ['id', 'invoice_id', 'track_id', 'unit_price', 'quantity'], 'playlists': ['id', 'name'], 'playlist_tracks': ['playlist_id', 'track_id'] }

{ 'invoices': ['id', 'billing_state', 'billing_country'] }

TABLE invoices ( invoices.id (INTEGER), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), )

TABLE invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Possible JOINs: invoices.customer_id = customers.id

store_1

How many invoices were billed from each state?

medium

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

SELECT billing_state , COUNT(*) FROM invoices WHERE billing_country = "USA" GROUP BY billing_state;

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

{ 'artists': ['id', 'name'], 'sqlite_sequence': ['name', 'seq'], 'albums': ['id', 'title', 'artist_id'], 'employees': ['id', 'last_name', 'first_name', 'title', 'reports_to', 'birth_date', 'hire_date', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email'], 'customers': ['id', 'first_name', 'last_name', 'company', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email', 'support_rep_id'], 'genres': ['id', 'name'], 'invoices': ['id', 'customer_id', 'invoice_date', 'billing_address', 'billing_city', 'billing_state', 'billing_country', 'billing_postal_code', 'total'], 'media_types': ['id', 'name'], 'tracks': ['id', 'name', 'album_id', 'media_type_id', 'genre_id', 'composer', 'milliseconds', 'bytes', 'unit_price'], 'invoice_lines': ['id', 'invoice_id', 'track_id', 'unit_price', 'quantity'], 'playlists': ['id', 'name'], 'playlist_tracks': ['playlist_id', 'track_id'] }

{ 'invoices': ['id', 'billing_state', 'billing_country'] }

TABLE invoices ( invoices.id (INTEGER), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), )

TABLE invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Possible JOINs: invoices.customer_id = customers.id

store_1

List the state in the US with the most invoices.

extra

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

SELECT billing_state , COUNT(*) FROM invoices WHERE billing_country = "USA" GROUP BY billing_state ORDER BY COUNT(*) DESC LIMIT 1;

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

{ 'artists': ['id', 'name'], 'sqlite_sequence': ['name', 'seq'], 'albums': ['id', 'title', 'artist_id'], 'employees': ['id', 'last_name', 'first_name', 'title', 'reports_to', 'birth_date', 'hire_date', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email'], 'customers': ['id', 'first_name', 'last_name', 'company', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email', 'support_rep_id'], 'genres': ['id', 'name'], 'invoices': ['id', 'customer_id', 'invoice_date', 'billing_address', 'billing_city', 'billing_state', 'billing_country', 'billing_postal_code', 'total'], 'media_types': ['id', 'name'], 'tracks': ['id', 'name', 'album_id', 'media_type_id', 'genre_id', 'composer', 'milliseconds', 'bytes', 'unit_price'], 'invoice_lines': ['id', 'invoice_id', 'track_id', 'unit_price', 'quantity'], 'playlists': ['id', 'name'], 'playlist_tracks': ['playlist_id', 'track_id'] }

{ 'invoices': ['id', 'billing_state', 'billing_country'] }

TABLE invoices ( invoices.id (INTEGER), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), )

TABLE invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Possible JOINs: invoices.customer_id = customers.id

store_1

What are the states with the most invoices?

extra

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

SELECT billing_state , COUNT(*) FROM invoices WHERE billing_country = "USA" GROUP BY billing_state ORDER BY COUNT(*) DESC LIMIT 1;

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

{ 'artists': ['id', 'name'], 'sqlite_sequence': ['name', 'seq'], 'albums': ['id', 'title', 'artist_id'], 'employees': ['id', 'last_name', 'first_name', 'title', 'reports_to', 'birth_date', 'hire_date', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email'], 'customers': ['id', 'first_name', 'last_name', 'company', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email', 'support_rep_id'], 'genres': ['id', 'name'], 'invoices': ['id', 'customer_id', 'invoice_date', 'billing_address', 'billing_city', 'billing_state', 'billing_country', 'billing_postal_code', 'total'], 'media_types': ['id', 'name'], 'tracks': ['id', 'name', 'album_id', 'media_type_id', 'genre_id', 'composer', 'milliseconds', 'bytes', 'unit_price'], 'invoice_lines': ['id', 'invoice_id', 'track_id', 'unit_price', 'quantity'], 'playlists': ['id', 'name'], 'playlist_tracks': ['playlist_id', 'track_id'] }

{ 'invoices': ['id', 'billing_state', 'billing_country'] }

TABLE invoices ( invoices.id (INTEGER), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), )

TABLE invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Possible JOINs: invoices.customer_id = customers.id

store_1

List the number of invoices and the invoice total from California.

medium

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

SELECT billing_state , COUNT(*) , SUM(total) FROM invoices WHERE billing_state = "CA";

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

{ 'artists': ['id', 'name'], 'sqlite_sequence': ['name', 'seq'], 'albums': ['id', 'title', 'artist_id'], 'employees': ['id', 'last_name', 'first_name', 'title', 'reports_to', 'birth_date', 'hire_date', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email'], 'customers': ['id', 'first_name', 'last_name', 'company', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email', 'support_rep_id'], 'genres': ['id', 'name'], 'invoices': ['id', 'customer_id', 'invoice_date', 'billing_address', 'billing_city', 'billing_state', 'billing_country', 'billing_postal_code', 'total'], 'media_types': ['id', 'name'], 'tracks': ['id', 'name', 'album_id', 'media_type_id', 'genre_id', 'composer', 'milliseconds', 'bytes', 'unit_price'], 'invoice_lines': ['id', 'invoice_id', 'track_id', 'unit_price', 'quantity'], 'playlists': ['id', 'name'], 'playlist_tracks': ['playlist_id', 'track_id'] }

{ 'invoices': ['id', 'billing_state', 'total'] }

TABLE invoices ( invoices.id (INTEGER), invoices.billing_state (VARCHAR(40)), invoices.total (NUMERIC(10,2)), )

TABLE invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Possible JOINs: invoices.customer_id = customers.id

store_1

What is the number of invoices and total money billed in them from CA?

medium

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

SELECT billing_state , COUNT(*) , SUM(total) FROM invoices WHERE billing_state = "CA";

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

{ 'artists': ['id', 'name'], 'sqlite_sequence': ['name', 'seq'], 'albums': ['id', 'title', 'artist_id'], 'employees': ['id', 'last_name', 'first_name', 'title', 'reports_to', 'birth_date', 'hire_date', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email'], 'customers': ['id', 'first_name', 'last_name', 'company', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email', 'support_rep_id'], 'genres': ['id', 'name'], 'invoices': ['id', 'customer_id', 'invoice_date', 'billing_address', 'billing_city', 'billing_state', 'billing_country', 'billing_postal_code', 'total'], 'media_types': ['id', 'name'], 'tracks': ['id', 'name', 'album_id', 'media_type_id', 'genre_id', 'composer', 'milliseconds', 'bytes', 'unit_price'], 'invoice_lines': ['id', 'invoice_id', 'track_id', 'unit_price', 'quantity'], 'playlists': ['id', 'name'], 'playlist_tracks': ['playlist_id', 'track_id'] }

{ 'invoices': ['id', 'billing_state', 'total'] }

TABLE invoices ( invoices.id (INTEGER), invoices.billing_state (VARCHAR(40)), invoices.total (NUMERIC(10,2)), )

TABLE invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Possible JOINs: invoices.customer_id = customers.id

store_1

List Aerosmith's albums.

medium

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

SELECT albums.title FROM albums JOIN artists ON albums.artist_id = artists.id WHERE artists.name = "Aerosmith";

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

{ 'artists': ['id', 'name'], 'sqlite_sequence': ['name', 'seq'], 'albums': ['id', 'title', 'artist_id'], 'employees': ['id', 'last_name', 'first_name', 'title', 'reports_to', 'birth_date', 'hire_date', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email'], 'customers': ['id', 'first_name', 'last_name', 'company', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email', 'support_rep_id'], 'genres': ['id', 'name'], 'invoices': ['id', 'customer_id', 'invoice_date', 'billing_address', 'billing_city', 'billing_state', 'billing_country', 'billing_postal_code', 'total'], 'media_types': ['id', 'name'], 'tracks': ['id', 'name', 'album_id', 'media_type_id', 'genre_id', 'composer', 'milliseconds', 'bytes', 'unit_price'], 'invoice_lines': ['id', 'invoice_id', 'track_id', 'unit_price', 'quantity'], 'playlists': ['id', 'name'], 'playlist_tracks': ['playlist_id', 'track_id'] }

{ 'albums': ['id', 'title', 'artist_id'], 'artists': ['id', 'name'] }

TABLE albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) TABLE artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Possible JOINs: albums.artist_id = artists.id

TABLE albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) TABLE artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Possible JOINs: albums.artist_id = artists.id

store_1

What are the titles of all the Aerosmith albums?

medium

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

SELECT albums.title FROM albums JOIN artists ON albums.artist_id = artists.id WHERE artists.name = "Aerosmith";

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

{ 'artists': ['id', 'name'], 'sqlite_sequence': ['name', 'seq'], 'albums': ['id', 'title', 'artist_id'], 'employees': ['id', 'last_name', 'first_name', 'title', 'reports_to', 'birth_date', 'hire_date', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email'], 'customers': ['id', 'first_name', 'last_name', 'company', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email', 'support_rep_id'], 'genres': ['id', 'name'], 'invoices': ['id', 'customer_id', 'invoice_date', 'billing_address', 'billing_city', 'billing_state', 'billing_country', 'billing_postal_code', 'total'], 'media_types': ['id', 'name'], 'tracks': ['id', 'name', 'album_id', 'media_type_id', 'genre_id', 'composer', 'milliseconds', 'bytes', 'unit_price'], 'invoice_lines': ['id', 'invoice_id', 'track_id', 'unit_price', 'quantity'], 'playlists': ['id', 'name'], 'playlist_tracks': ['playlist_id', 'track_id'] }

{ 'albums': ['id', 'title', 'artist_id'], 'artists': ['id', 'name'] }

TABLE albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) TABLE artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Possible JOINs: albums.artist_id = artists.id

TABLE albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) TABLE artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Possible JOINs: albums.artist_id = artists.id

store_1

How many albums does Billy Cobham has?

medium

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

SELECT count(*) FROM albums JOIN artists ON albums.artist_id = artists.id WHERE artists.name = "Billy Cobham";

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

{ 'artists': ['id', 'name'], 'sqlite_sequence': ['name', 'seq'], 'albums': ['id', 'title', 'artist_id'], 'employees': ['id', 'last_name', 'first_name', 'title', 'reports_to', 'birth_date', 'hire_date', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email'], 'customers': ['id', 'first_name', 'last_name', 'company', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email', 'support_rep_id'], 'genres': ['id', 'name'], 'invoices': ['id', 'customer_id', 'invoice_date', 'billing_address', 'billing_city', 'billing_state', 'billing_country', 'billing_postal_code', 'total'], 'media_types': ['id', 'name'], 'tracks': ['id', 'name', 'album_id', 'media_type_id', 'genre_id', 'composer', 'milliseconds', 'bytes', 'unit_price'], 'invoice_lines': ['id', 'invoice_id', 'track_id', 'unit_price', 'quantity'], 'playlists': ['id', 'name'], 'playlist_tracks': ['playlist_id', 'track_id'] }

{ 'albums': ['id', 'artist_id'], 'artists': ['id', 'name'] }

TABLE albums ( albums.id (INTEGER), albums.artist_id (INTEGER), ) TABLE artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Possible JOINs: albums.artist_id = artists.id

TABLE albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) TABLE artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Possible JOINs: albums.artist_id = artists.id

store_1

How many albums has Billy Cobam released?

medium

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

SELECT count(*) FROM albums JOIN artists ON albums.artist_id = artists.id WHERE artists.name = "Billy Cobham";

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

{ 'artists': ['id', 'name'], 'sqlite_sequence': ['name', 'seq'], 'albums': ['id', 'title', 'artist_id'], 'employees': ['id', 'last_name', 'first_name', 'title', 'reports_to', 'birth_date', 'hire_date', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email'], 'customers': ['id', 'first_name', 'last_name', 'company', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email', 'support_rep_id'], 'genres': ['id', 'name'], 'invoices': ['id', 'customer_id', 'invoice_date', 'billing_address', 'billing_city', 'billing_state', 'billing_country', 'billing_postal_code', 'total'], 'media_types': ['id', 'name'], 'tracks': ['id', 'name', 'album_id', 'media_type_id', 'genre_id', 'composer', 'milliseconds', 'bytes', 'unit_price'], 'invoice_lines': ['id', 'invoice_id', 'track_id', 'unit_price', 'quantity'], 'playlists': ['id', 'name'], 'playlist_tracks': ['playlist_id', 'track_id'] }

{ 'albums': ['id', 'artist_id'], 'artists': ['id', 'name'] }

TABLE albums ( albums.id (INTEGER), albums.artist_id (INTEGER), ) TABLE artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Possible JOINs: albums.artist_id = artists.id

TABLE albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) TABLE artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Possible JOINs: albums.artist_id = artists.id

store_1

Eduardo Martins is a customer at which company?

medium

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

SELECT company FROM customers WHERE first_name = "Eduardo" AND last_name = "Martins";

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

{ 'artists': ['id', 'name'], 'sqlite_sequence': ['name', 'seq'], 'albums': ['id', 'title', 'artist_id'], 'employees': ['id', 'last_name', 'first_name', 'title', 'reports_to', 'birth_date', 'hire_date', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email'], 'customers': ['id', 'first_name', 'last_name', 'company', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email', 'support_rep_id'], 'genres': ['id', 'name'], 'invoices': ['id', 'customer_id', 'invoice_date', 'billing_address', 'billing_city', 'billing_state', 'billing_country', 'billing_postal_code', 'total'], 'media_types': ['id', 'name'], 'tracks': ['id', 'name', 'album_id', 'media_type_id', 'genre_id', 'composer', 'milliseconds', 'bytes', 'unit_price'], 'invoice_lines': ['id', 'invoice_id', 'track_id', 'unit_price', 'quantity'], 'playlists': ['id', 'name'], 'playlist_tracks': ['playlist_id', 'track_id'] }

{ 'customers': ['id', 'first_name', 'last_name', 'company'] }

TABLE customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), )

TABLE customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Possible JOINs: customers.support_rep_id = employees.id

store_1

What is the company where Eduardo Martins is a customer?

medium

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

SELECT company FROM customers WHERE first_name = "Eduardo" AND last_name = "Martins";

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

{ 'artists': ['id', 'name'], 'sqlite_sequence': ['name', 'seq'], 'albums': ['id', 'title', 'artist_id'], 'employees': ['id', 'last_name', 'first_name', 'title', 'reports_to', 'birth_date', 'hire_date', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email'], 'customers': ['id', 'first_name', 'last_name', 'company', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email', 'support_rep_id'], 'genres': ['id', 'name'], 'invoices': ['id', 'customer_id', 'invoice_date', 'billing_address', 'billing_city', 'billing_state', 'billing_country', 'billing_postal_code', 'total'], 'media_types': ['id', 'name'], 'tracks': ['id', 'name', 'album_id', 'media_type_id', 'genre_id', 'composer', 'milliseconds', 'bytes', 'unit_price'], 'invoice_lines': ['id', 'invoice_id', 'track_id', 'unit_price', 'quantity'], 'playlists': ['id', 'name'], 'playlist_tracks': ['playlist_id', 'track_id'] }

{ 'customers': ['id', 'first_name', 'last_name', 'company'] }

TABLE customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), )

TABLE customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Possible JOINs: customers.support_rep_id = employees.id

store_1

What is Astrid Gruber's email and phone number?

medium

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

SELECT email , phone FROM customers WHERE first_name = "Astrid" AND last_name = "Gruber";

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

{ 'artists': ['id', 'name'], 'sqlite_sequence': ['name', 'seq'], 'albums': ['id', 'title', 'artist_id'], 'employees': ['id', 'last_name', 'first_name', 'title', 'reports_to', 'birth_date', 'hire_date', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email'], 'customers': ['id', 'first_name', 'last_name', 'company', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email', 'support_rep_id'], 'genres': ['id', 'name'], 'invoices': ['id', 'customer_id', 'invoice_date', 'billing_address', 'billing_city', 'billing_state', 'billing_country', 'billing_postal_code', 'total'], 'media_types': ['id', 'name'], 'tracks': ['id', 'name', 'album_id', 'media_type_id', 'genre_id', 'composer', 'milliseconds', 'bytes', 'unit_price'], 'invoice_lines': ['id', 'invoice_id', 'track_id', 'unit_price', 'quantity'], 'playlists': ['id', 'name'], 'playlist_tracks': ['playlist_id', 'track_id'] }

{ 'customers': ['id', 'first_name', 'last_name', 'phone', 'email'] }

TABLE customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.phone (VARCHAR(24)), customers.email (VARCHAR(60)), )

TABLE customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Possible JOINs: customers.support_rep_id = employees.id

store_1

What is the email and phone number of Astrid Gruber the customer?

medium

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

SELECT email , phone FROM customers WHERE first_name = "Astrid" AND last_name = "Gruber";

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

{ 'artists': ['id', 'name'], 'sqlite_sequence': ['name', 'seq'], 'albums': ['id', 'title', 'artist_id'], 'employees': ['id', 'last_name', 'first_name', 'title', 'reports_to', 'birth_date', 'hire_date', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email'], 'customers': ['id', 'first_name', 'last_name', 'company', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email', 'support_rep_id'], 'genres': ['id', 'name'], 'invoices': ['id', 'customer_id', 'invoice_date', 'billing_address', 'billing_city', 'billing_state', 'billing_country', 'billing_postal_code', 'total'], 'media_types': ['id', 'name'], 'tracks': ['id', 'name', 'album_id', 'media_type_id', 'genre_id', 'composer', 'milliseconds', 'bytes', 'unit_price'], 'invoice_lines': ['id', 'invoice_id', 'track_id', 'unit_price', 'quantity'], 'playlists': ['id', 'name'], 'playlist_tracks': ['playlist_id', 'track_id'] }

{ 'customers': ['id', 'first_name', 'last_name', 'phone', 'email'] }

TABLE customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.phone (VARCHAR(24)), customers.email (VARCHAR(60)), )

TABLE customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Possible JOINs: customers.support_rep_id = employees.id

store_1

How many customers live in Prague city?

easy

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

SELECT count(*) FROM customers WHERE city = "Prague";

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

{ 'artists': ['id', 'name'], 'sqlite_sequence': ['name', 'seq'], 'albums': ['id', 'title', 'artist_id'], 'employees': ['id', 'last_name', 'first_name', 'title', 'reports_to', 'birth_date', 'hire_date', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email'], 'customers': ['id', 'first_name', 'last_name', 'company', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email', 'support_rep_id'], 'genres': ['id', 'name'], 'invoices': ['id', 'customer_id', 'invoice_date', 'billing_address', 'billing_city', 'billing_state', 'billing_country', 'billing_postal_code', 'total'], 'media_types': ['id', 'name'], 'tracks': ['id', 'name', 'album_id', 'media_type_id', 'genre_id', 'composer', 'milliseconds', 'bytes', 'unit_price'], 'invoice_lines': ['id', 'invoice_id', 'track_id', 'unit_price', 'quantity'], 'playlists': ['id', 'name'], 'playlist_tracks': ['playlist_id', 'track_id'] }

{ 'customers': ['id', 'city'] }

TABLE customers ( customers.id (INTEGER), customers.city (VARCHAR(40)), )

TABLE customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Possible JOINs: customers.support_rep_id = employees.id

store_1

How many customers live in the city of Prague?

easy

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

SELECT count(*) FROM customers WHERE city = "Prague";

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

{ 'artists': ['id', 'name'], 'sqlite_sequence': ['name', 'seq'], 'albums': ['id', 'title', 'artist_id'], 'employees': ['id', 'last_name', 'first_name', 'title', 'reports_to', 'birth_date', 'hire_date', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email'], 'customers': ['id', 'first_name', 'last_name', 'company', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email', 'support_rep_id'], 'genres': ['id', 'name'], 'invoices': ['id', 'customer_id', 'invoice_date', 'billing_address', 'billing_city', 'billing_state', 'billing_country', 'billing_postal_code', 'total'], 'media_types': ['id', 'name'], 'tracks': ['id', 'name', 'album_id', 'media_type_id', 'genre_id', 'composer', 'milliseconds', 'bytes', 'unit_price'], 'invoice_lines': ['id', 'invoice_id', 'track_id', 'unit_price', 'quantity'], 'playlists': ['id', 'name'], 'playlist_tracks': ['playlist_id', 'track_id'] }

{ 'customers': ['id', 'city'] }

TABLE customers ( customers.id (INTEGER), customers.city (VARCHAR(40)), )

TABLE customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Possible JOINs: customers.support_rep_id = employees.id

store_1

How many customers in state of CA?

easy

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

SELECT count(*) FROM customers WHERE state = "CA";

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

{ 'artists': ['id', 'name'], 'sqlite_sequence': ['name', 'seq'], 'albums': ['id', 'title', 'artist_id'], 'employees': ['id', 'last_name', 'first_name', 'title', 'reports_to', 'birth_date', 'hire_date', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email'], 'customers': ['id', 'first_name', 'last_name', 'company', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email', 'support_rep_id'], 'genres': ['id', 'name'], 'invoices': ['id', 'customer_id', 'invoice_date', 'billing_address', 'billing_city', 'billing_state', 'billing_country', 'billing_postal_code', 'total'], 'media_types': ['id', 'name'], 'tracks': ['id', 'name', 'album_id', 'media_type_id', 'genre_id', 'composer', 'milliseconds', 'bytes', 'unit_price'], 'invoice_lines': ['id', 'invoice_id', 'track_id', 'unit_price', 'quantity'], 'playlists': ['id', 'name'], 'playlist_tracks': ['playlist_id', 'track_id'] }

{ 'customers': ['id', 'state'] }

TABLE customers ( customers.id (INTEGER), customers.state (VARCHAR(40)), )

TABLE customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Possible JOINs: customers.support_rep_id = employees.id

store_1

How many customers are from California?

easy

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

SELECT count(*) FROM customers WHERE state = "CA";

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

{ 'artists': ['id', 'name'], 'sqlite_sequence': ['name', 'seq'], 'albums': ['id', 'title', 'artist_id'], 'employees': ['id', 'last_name', 'first_name', 'title', 'reports_to', 'birth_date', 'hire_date', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email'], 'customers': ['id', 'first_name', 'last_name', 'company', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email', 'support_rep_id'], 'genres': ['id', 'name'], 'invoices': ['id', 'customer_id', 'invoice_date', 'billing_address', 'billing_city', 'billing_state', 'billing_country', 'billing_postal_code', 'total'], 'media_types': ['id', 'name'], 'tracks': ['id', 'name', 'album_id', 'media_type_id', 'genre_id', 'composer', 'milliseconds', 'bytes', 'unit_price'], 'invoice_lines': ['id', 'invoice_id', 'track_id', 'unit_price', 'quantity'], 'playlists': ['id', 'name'], 'playlist_tracks': ['playlist_id', 'track_id'] }

{ 'customers': ['id', 'state'] }

TABLE customers ( customers.id (INTEGER), customers.state (VARCHAR(40)), )

TABLE customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Possible JOINs: customers.support_rep_id = employees.id

store_1

What country does Roberto Almeida live?

medium

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

SELECT country FROM customers WHERE first_name = "Roberto" AND last_name = "Almeida";

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

{ 'artists': ['id', 'name'], 'sqlite_sequence': ['name', 'seq'], 'albums': ['id', 'title', 'artist_id'], 'employees': ['id', 'last_name', 'first_name', 'title', 'reports_to', 'birth_date', 'hire_date', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email'], 'customers': ['id', 'first_name', 'last_name', 'company', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email', 'support_rep_id'], 'genres': ['id', 'name'], 'invoices': ['id', 'customer_id', 'invoice_date', 'billing_address', 'billing_city', 'billing_state', 'billing_country', 'billing_postal_code', 'total'], 'media_types': ['id', 'name'], 'tracks': ['id', 'name', 'album_id', 'media_type_id', 'genre_id', 'composer', 'milliseconds', 'bytes', 'unit_price'], 'invoice_lines': ['id', 'invoice_id', 'track_id', 'unit_price', 'quantity'], 'playlists': ['id', 'name'], 'playlist_tracks': ['playlist_id', 'track_id'] }

{ 'customers': ['id', 'first_name', 'last_name', 'country'] }

TABLE customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.country (VARCHAR(40)), )

TABLE customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Possible JOINs: customers.support_rep_id = employees.id

store_1

In which country does Roberto Almeida?

medium

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

SELECT country FROM customers WHERE first_name = "Roberto" AND last_name = "Almeida";

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

{ 'artists': ['id', 'name'], 'sqlite_sequence': ['name', 'seq'], 'albums': ['id', 'title', 'artist_id'], 'employees': ['id', 'last_name', 'first_name', 'title', 'reports_to', 'birth_date', 'hire_date', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email'], 'customers': ['id', 'first_name', 'last_name', 'company', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email', 'support_rep_id'], 'genres': ['id', 'name'], 'invoices': ['id', 'customer_id', 'invoice_date', 'billing_address', 'billing_city', 'billing_state', 'billing_country', 'billing_postal_code', 'total'], 'media_types': ['id', 'name'], 'tracks': ['id', 'name', 'album_id', 'media_type_id', 'genre_id', 'composer', 'milliseconds', 'bytes', 'unit_price'], 'invoice_lines': ['id', 'invoice_id', 'track_id', 'unit_price', 'quantity'], 'playlists': ['id', 'name'], 'playlist_tracks': ['playlist_id', 'track_id'] }

{ 'customers': ['id', 'first_name', 'last_name', 'country'] }

TABLE customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.country (VARCHAR(40)), )

TABLE customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Possible JOINs: customers.support_rep_id = employees.id

store_1

List the name of albums that are released by aritist whose name has 'Led'

hard

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

SELECT albums.title FROM artists JOIN albums ON artists.id = albums.artist_id WHERE artists.name LIKE '%Led%'

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

{ 'artists': ['id', 'name'], 'sqlite_sequence': ['name', 'seq'], 'albums': ['id', 'title', 'artist_id'], 'employees': ['id', 'last_name', 'first_name', 'title', 'reports_to', 'birth_date', 'hire_date', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email'], 'customers': ['id', 'first_name', 'last_name', 'company', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email', 'support_rep_id'], 'genres': ['id', 'name'], 'invoices': ['id', 'customer_id', 'invoice_date', 'billing_address', 'billing_city', 'billing_state', 'billing_country', 'billing_postal_code', 'total'], 'media_types': ['id', 'name'], 'tracks': ['id', 'name', 'album_id', 'media_type_id', 'genre_id', 'composer', 'milliseconds', 'bytes', 'unit_price'], 'invoice_lines': ['id', 'invoice_id', 'track_id', 'unit_price', 'quantity'], 'playlists': ['id', 'name'], 'playlist_tracks': ['playlist_id', 'track_id'] }

{ 'artists': ['id', 'name'], 'albums': ['id', 'title', 'artist_id'] }

TABLE albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) TABLE artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Possible JOINs: albums.artist_id = artists.id

TABLE albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) TABLE artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Possible JOINs: albums.artist_id = artists.id

store_1

What is the title of the album that was released by the artist whose name has the phrase 'Led'?

hard

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

SELECT albums.title FROM artists JOIN albums ON artists.id = albums.artist_id WHERE artists.name LIKE '%Led%'

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

{ 'artists': ['id', 'name'], 'sqlite_sequence': ['name', 'seq'], 'albums': ['id', 'title', 'artist_id'], 'employees': ['id', 'last_name', 'first_name', 'title', 'reports_to', 'birth_date', 'hire_date', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email'], 'customers': ['id', 'first_name', 'last_name', 'company', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email', 'support_rep_id'], 'genres': ['id', 'name'], 'invoices': ['id', 'customer_id', 'invoice_date', 'billing_address', 'billing_city', 'billing_state', 'billing_country', 'billing_postal_code', 'total'], 'media_types': ['id', 'name'], 'tracks': ['id', 'name', 'album_id', 'media_type_id', 'genre_id', 'composer', 'milliseconds', 'bytes', 'unit_price'], 'invoice_lines': ['id', 'invoice_id', 'track_id', 'unit_price', 'quantity'], 'playlists': ['id', 'name'], 'playlist_tracks': ['playlist_id', 'track_id'] }

{ 'artists': ['id', 'name'], 'albums': ['id', 'title', 'artist_id'] }

TABLE albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) TABLE artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Possible JOINs: albums.artist_id = artists.id

TABLE albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) TABLE artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Possible JOINs: albums.artist_id = artists.id

store_1

How many customers does Steve Johnson support?

medium

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

SELECT count(*) FROM employees JOIN customers ON customers.support_rep_id = employees.id WHERE employees.first_name = "Steve" AND employees.last_name = "Johnson";

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

{ 'artists': ['id', 'name'], 'sqlite_sequence': ['name', 'seq'], 'albums': ['id', 'title', 'artist_id'], 'employees': ['id', 'last_name', 'first_name', 'title', 'reports_to', 'birth_date', 'hire_date', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email'], 'customers': ['id', 'first_name', 'last_name', 'company', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email', 'support_rep_id'], 'genres': ['id', 'name'], 'invoices': ['id', 'customer_id', 'invoice_date', 'billing_address', 'billing_city', 'billing_state', 'billing_country', 'billing_postal_code', 'total'], 'media_types': ['id', 'name'], 'tracks': ['id', 'name', 'album_id', 'media_type_id', 'genre_id', 'composer', 'milliseconds', 'bytes', 'unit_price'], 'invoice_lines': ['id', 'invoice_id', 'track_id', 'unit_price', 'quantity'], 'playlists': ['id', 'name'], 'playlist_tracks': ['playlist_id', 'track_id'] }

{ 'employees': ['id', 'last_name', 'first_name'], 'customers': ['id', 'support_rep_id'] }

TABLE customers ( customers.id (INTEGER), customers.support_rep_id (INTEGER), ) TABLE employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), ) Possible JOINs: customers.support_rep_id = employees.id

TABLE customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) TABLE employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Possible JOINs: customers.support_rep_id = employees.id employees.reports_to = employees.id

store_1

What is the count of customers that Steve Johnson supports?

medium

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

SELECT count(*) FROM employees JOIN customers ON customers.support_rep_id = employees.id WHERE employees.first_name = "Steve" AND employees.last_name = "Johnson";

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

{ 'artists': ['id', 'name'], 'sqlite_sequence': ['name', 'seq'], 'albums': ['id', 'title', 'artist_id'], 'employees': ['id', 'last_name', 'first_name', 'title', 'reports_to', 'birth_date', 'hire_date', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email'], 'customers': ['id', 'first_name', 'last_name', 'company', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email', 'support_rep_id'], 'genres': ['id', 'name'], 'invoices': ['id', 'customer_id', 'invoice_date', 'billing_address', 'billing_city', 'billing_state', 'billing_country', 'billing_postal_code', 'total'], 'media_types': ['id', 'name'], 'tracks': ['id', 'name', 'album_id', 'media_type_id', 'genre_id', 'composer', 'milliseconds', 'bytes', 'unit_price'], 'invoice_lines': ['id', 'invoice_id', 'track_id', 'unit_price', 'quantity'], 'playlists': ['id', 'name'], 'playlist_tracks': ['playlist_id', 'track_id'] }

{ 'employees': ['id', 'last_name', 'first_name'], 'customers': ['id', 'support_rep_id'] }

TABLE customers ( customers.id (INTEGER), customers.support_rep_id (INTEGER), ) TABLE employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), ) Possible JOINs: customers.support_rep_id = employees.id

TABLE customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) TABLE employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Possible JOINs: customers.support_rep_id = employees.id employees.reports_to = employees.id

store_1

What is the title, phone and hire date of Nancy Edwards?

medium

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

SELECT title , phone , hire_date FROM employees WHERE first_name = "Nancy" AND last_name = "Edwards";

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

{ 'artists': ['id', 'name'], 'sqlite_sequence': ['name', 'seq'], 'albums': ['id', 'title', 'artist_id'], 'employees': ['id', 'last_name', 'first_name', 'title', 'reports_to', 'birth_date', 'hire_date', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email'], 'customers': ['id', 'first_name', 'last_name', 'company', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email', 'support_rep_id'], 'genres': ['id', 'name'], 'invoices': ['id', 'customer_id', 'invoice_date', 'billing_address', 'billing_city', 'billing_state', 'billing_country', 'billing_postal_code', 'total'], 'media_types': ['id', 'name'], 'tracks': ['id', 'name', 'album_id', 'media_type_id', 'genre_id', 'composer', 'milliseconds', 'bytes', 'unit_price'], 'invoice_lines': ['id', 'invoice_id', 'track_id', 'unit_price', 'quantity'], 'playlists': ['id', 'name'], 'playlist_tracks': ['playlist_id', 'track_id'] }

{ 'employees': ['id', 'last_name', 'first_name', 'title', 'hire_date', 'phone'] }

TABLE employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.hire_date (TIMESTAMP), employees.phone (VARCHAR(24)), )

TABLE employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Possible JOINs: employees.reports_to = employees.id

store_1

What is the title, phone number and hire date for the employee named Nancy Edwards?

medium

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

SELECT title , phone , hire_date FROM employees WHERE first_name = "Nancy" AND last_name = "Edwards";

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

{ 'artists': ['id', 'name'], 'sqlite_sequence': ['name', 'seq'], 'albums': ['id', 'title', 'artist_id'], 'employees': ['id', 'last_name', 'first_name', 'title', 'reports_to', 'birth_date', 'hire_date', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email'], 'customers': ['id', 'first_name', 'last_name', 'company', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email', 'support_rep_id'], 'genres': ['id', 'name'], 'invoices': ['id', 'customer_id', 'invoice_date', 'billing_address', 'billing_city', 'billing_state', 'billing_country', 'billing_postal_code', 'total'], 'media_types': ['id', 'name'], 'tracks': ['id', 'name', 'album_id', 'media_type_id', 'genre_id', 'composer', 'milliseconds', 'bytes', 'unit_price'], 'invoice_lines': ['id', 'invoice_id', 'track_id', 'unit_price', 'quantity'], 'playlists': ['id', 'name'], 'playlist_tracks': ['playlist_id', 'track_id'] }

{ 'employees': ['id', 'last_name', 'first_name', 'title', 'hire_date', 'phone'] }

TABLE employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.hire_date (TIMESTAMP), employees.phone (VARCHAR(24)), )

TABLE employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Possible JOINs: employees.reports_to = employees.id

store_1

find the full name of employees who report to Nancy Edwards?

extra

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

SELECT employees.first_name , employees.last_name FROM employees JOIN employees ON employees.id = employees.reports_to WHERE employees.first_name = "Nancy" AND employees.last_name = "Edwards";

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

{ 'artists': ['id', 'name'], 'sqlite_sequence': ['name', 'seq'], 'albums': ['id', 'title', 'artist_id'], 'employees': ['id', 'last_name', 'first_name', 'title', 'reports_to', 'birth_date', 'hire_date', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email'], 'customers': ['id', 'first_name', 'last_name', 'company', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email', 'support_rep_id'], 'genres': ['id', 'name'], 'invoices': ['id', 'customer_id', 'invoice_date', 'billing_address', 'billing_city', 'billing_state', 'billing_country', 'billing_postal_code', 'total'], 'media_types': ['id', 'name'], 'tracks': ['id', 'name', 'album_id', 'media_type_id', 'genre_id', 'composer', 'milliseconds', 'bytes', 'unit_price'], 'invoice_lines': ['id', 'invoice_id', 'track_id', 'unit_price', 'quantity'], 'playlists': ['id', 'name'], 'playlist_tracks': ['playlist_id', 'track_id'] }

{ 'employees': ['id', 'last_name', 'first_name', 'reports_to'] }

TABLE employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.reports_to (INTEGER), ) Possible JOINs: employees.reports_to = employees.id

TABLE employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Possible JOINs: employees.reports_to = employees.id

store_1

What is the first and last name of the employee who reports to Nancy Edwards?

extra

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

SELECT employees.first_name , employees.last_name FROM employees JOIN employees ON employees.id = employees.reports_to WHERE employees.first_name = "Nancy" AND employees.last_name = "Edwards";

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

{ 'artists': ['id', 'name'], 'sqlite_sequence': ['name', 'seq'], 'albums': ['id', 'title', 'artist_id'], 'employees': ['id', 'last_name', 'first_name', 'title', 'reports_to', 'birth_date', 'hire_date', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email'], 'customers': ['id', 'first_name', 'last_name', 'company', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email', 'support_rep_id'], 'genres': ['id', 'name'], 'invoices': ['id', 'customer_id', 'invoice_date', 'billing_address', 'billing_city', 'billing_state', 'billing_country', 'billing_postal_code', 'total'], 'media_types': ['id', 'name'], 'tracks': ['id', 'name', 'album_id', 'media_type_id', 'genre_id', 'composer', 'milliseconds', 'bytes', 'unit_price'], 'invoice_lines': ['id', 'invoice_id', 'track_id', 'unit_price', 'quantity'], 'playlists': ['id', 'name'], 'playlist_tracks': ['playlist_id', 'track_id'] }

{ 'employees': ['id', 'last_name', 'first_name', 'reports_to'] }

TABLE employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.reports_to (INTEGER), ) Possible JOINs: employees.reports_to = employees.id

TABLE employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Possible JOINs: employees.reports_to = employees.id

store_1

What is the address of employee Nancy Edwards?

medium

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

SELECT address FROM employees WHERE first_name = "Nancy" AND last_name = "Edwards";

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

{ 'artists': ['id', 'name'], 'sqlite_sequence': ['name', 'seq'], 'albums': ['id', 'title', 'artist_id'], 'employees': ['id', 'last_name', 'first_name', 'title', 'reports_to', 'birth_date', 'hire_date', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email'], 'customers': ['id', 'first_name', 'last_name', 'company', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email', 'support_rep_id'], 'genres': ['id', 'name'], 'invoices': ['id', 'customer_id', 'invoice_date', 'billing_address', 'billing_city', 'billing_state', 'billing_country', 'billing_postal_code', 'total'], 'media_types': ['id', 'name'], 'tracks': ['id', 'name', 'album_id', 'media_type_id', 'genre_id', 'composer', 'milliseconds', 'bytes', 'unit_price'], 'invoice_lines': ['id', 'invoice_id', 'track_id', 'unit_price', 'quantity'], 'playlists': ['id', 'name'], 'playlist_tracks': ['playlist_id', 'track_id'] }

{ 'employees': ['id', 'last_name', 'first_name', 'address'] }

TABLE employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.address (VARCHAR(70)), )

TABLE employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Possible JOINs: employees.reports_to = employees.id

store_1

What is Nancy Edwards's address?

medium

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

SELECT address FROM employees WHERE first_name = "Nancy" AND last_name = "Edwards";

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

{ 'artists': ['id', 'name'], 'sqlite_sequence': ['name', 'seq'], 'albums': ['id', 'title', 'artist_id'], 'employees': ['id', 'last_name', 'first_name', 'title', 'reports_to', 'birth_date', 'hire_date', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email'], 'customers': ['id', 'first_name', 'last_name', 'company', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email', 'support_rep_id'], 'genres': ['id', 'name'], 'invoices': ['id', 'customer_id', 'invoice_date', 'billing_address', 'billing_city', 'billing_state', 'billing_country', 'billing_postal_code', 'total'], 'media_types': ['id', 'name'], 'tracks': ['id', 'name', 'album_id', 'media_type_id', 'genre_id', 'composer', 'milliseconds', 'bytes', 'unit_price'], 'invoice_lines': ['id', 'invoice_id', 'track_id', 'unit_price', 'quantity'], 'playlists': ['id', 'name'], 'playlist_tracks': ['playlist_id', 'track_id'] }

{ 'employees': ['id', 'last_name', 'first_name', 'address'] }

TABLE employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.address (VARCHAR(70)), )

TABLE employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Possible JOINs: employees.reports_to = employees.id

store_1

Find the full name of employee who supported the most number of customers.

extra

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

SELECT employees.first_name , employees.last_name FROM employees JOIN customers ON employees.id = customers.support_rep_id GROUP BY employees.id ORDER BY count(*) DESC LIMIT 1

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

{ 'artists': ['id', 'name'], 'sqlite_sequence': ['name', 'seq'], 'albums': ['id', 'title', 'artist_id'], 'employees': ['id', 'last_name', 'first_name', 'title', 'reports_to', 'birth_date', 'hire_date', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email'], 'customers': ['id', 'first_name', 'last_name', 'company', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email', 'support_rep_id'], 'genres': ['id', 'name'], 'invoices': ['id', 'customer_id', 'invoice_date', 'billing_address', 'billing_city', 'billing_state', 'billing_country', 'billing_postal_code', 'total'], 'media_types': ['id', 'name'], 'tracks': ['id', 'name', 'album_id', 'media_type_id', 'genre_id', 'composer', 'milliseconds', 'bytes', 'unit_price'], 'invoice_lines': ['id', 'invoice_id', 'track_id', 'unit_price', 'quantity'], 'playlists': ['id', 'name'], 'playlist_tracks': ['playlist_id', 'track_id'] }

{ 'employees': ['id', 'last_name', 'first_name'], 'customers': ['id', 'support_rep_id'] }

TABLE customers ( customers.id (INTEGER), customers.support_rep_id (INTEGER), ) TABLE employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), ) Possible JOINs: customers.support_rep_id = employees.id

TABLE customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) TABLE employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Possible JOINs: customers.support_rep_id = employees.id employees.reports_to = employees.id

store_1

What is the full name of the employee who has the most customers?

extra

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

SELECT employees.first_name , employees.last_name FROM employees JOIN customers ON employees.id = customers.support_rep_id GROUP BY employees.id ORDER BY count(*) DESC LIMIT 1

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

{ 'artists': ['id', 'name'], 'sqlite_sequence': ['name', 'seq'], 'albums': ['id', 'title', 'artist_id'], 'employees': ['id', 'last_name', 'first_name', 'title', 'reports_to', 'birth_date', 'hire_date', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email'], 'customers': ['id', 'first_name', 'last_name', 'company', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email', 'support_rep_id'], 'genres': ['id', 'name'], 'invoices': ['id', 'customer_id', 'invoice_date', 'billing_address', 'billing_city', 'billing_state', 'billing_country', 'billing_postal_code', 'total'], 'media_types': ['id', 'name'], 'tracks': ['id', 'name', 'album_id', 'media_type_id', 'genre_id', 'composer', 'milliseconds', 'bytes', 'unit_price'], 'invoice_lines': ['id', 'invoice_id', 'track_id', 'unit_price', 'quantity'], 'playlists': ['id', 'name'], 'playlist_tracks': ['playlist_id', 'track_id'] }

{ 'employees': ['id', 'last_name', 'first_name'], 'customers': ['id', 'support_rep_id'] }

TABLE customers ( customers.id (INTEGER), customers.support_rep_id (INTEGER), ) TABLE employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), ) Possible JOINs: customers.support_rep_id = employees.id

TABLE customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) TABLE employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Possible JOINs: customers.support_rep_id = employees.id employees.reports_to = employees.id

store_1

How many employees are living in Canada?

easy

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

SELECT count(*) FROM employees WHERE country = "Canada";

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

{ 'artists': ['id', 'name'], 'sqlite_sequence': ['name', 'seq'], 'albums': ['id', 'title', 'artist_id'], 'employees': ['id', 'last_name', 'first_name', 'title', 'reports_to', 'birth_date', 'hire_date', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email'], 'customers': ['id', 'first_name', 'last_name', 'company', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email', 'support_rep_id'], 'genres': ['id', 'name'], 'invoices': ['id', 'customer_id', 'invoice_date', 'billing_address', 'billing_city', 'billing_state', 'billing_country', 'billing_postal_code', 'total'], 'media_types': ['id', 'name'], 'tracks': ['id', 'name', 'album_id', 'media_type_id', 'genre_id', 'composer', 'milliseconds', 'bytes', 'unit_price'], 'invoice_lines': ['id', 'invoice_id', 'track_id', 'unit_price', 'quantity'], 'playlists': ['id', 'name'], 'playlist_tracks': ['playlist_id', 'track_id'] }

{ 'employees': ['id', 'country'] }

TABLE employees ( employees.id (INTEGER), employees.country (VARCHAR(40)), )

TABLE employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Possible JOINs: employees.reports_to = employees.id

store_1

How many employees live in Canada?

easy

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

SELECT count(*) FROM employees WHERE country = "Canada";

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

{ 'artists': ['id', 'name'], 'sqlite_sequence': ['name', 'seq'], 'albums': ['id', 'title', 'artist_id'], 'employees': ['id', 'last_name', 'first_name', 'title', 'reports_to', 'birth_date', 'hire_date', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email'], 'customers': ['id', 'first_name', 'last_name', 'company', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email', 'support_rep_id'], 'genres': ['id', 'name'], 'invoices': ['id', 'customer_id', 'invoice_date', 'billing_address', 'billing_city', 'billing_state', 'billing_country', 'billing_postal_code', 'total'], 'media_types': ['id', 'name'], 'tracks': ['id', 'name', 'album_id', 'media_type_id', 'genre_id', 'composer', 'milliseconds', 'bytes', 'unit_price'], 'invoice_lines': ['id', 'invoice_id', 'track_id', 'unit_price', 'quantity'], 'playlists': ['id', 'name'], 'playlist_tracks': ['playlist_id', 'track_id'] }

{ 'employees': ['id', 'country'] }

TABLE employees ( employees.id (INTEGER), employees.country (VARCHAR(40)), )

TABLE employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Possible JOINs: employees.reports_to = employees.id

store_1

What is employee Nancy Edwards's phone number?

medium

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

SELECT phone FROM employees WHERE first_name = "Nancy" AND last_name = "Edwards";

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

{ 'artists': ['id', 'name'], 'sqlite_sequence': ['name', 'seq'], 'albums': ['id', 'title', 'artist_id'], 'employees': ['id', 'last_name', 'first_name', 'title', 'reports_to', 'birth_date', 'hire_date', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email'], 'customers': ['id', 'first_name', 'last_name', 'company', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email', 'support_rep_id'], 'genres': ['id', 'name'], 'invoices': ['id', 'customer_id', 'invoice_date', 'billing_address', 'billing_city', 'billing_state', 'billing_country', 'billing_postal_code', 'total'], 'media_types': ['id', 'name'], 'tracks': ['id', 'name', 'album_id', 'media_type_id', 'genre_id', 'composer', 'milliseconds', 'bytes', 'unit_price'], 'invoice_lines': ['id', 'invoice_id', 'track_id', 'unit_price', 'quantity'], 'playlists': ['id', 'name'], 'playlist_tracks': ['playlist_id', 'track_id'] }

{ 'employees': ['id', 'last_name', 'first_name', 'phone'] }

TABLE employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.phone (VARCHAR(24)), )

TABLE employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Possible JOINs: employees.reports_to = employees.id

store_1

What is the the phone number of Nancy Edwards?

medium

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

SELECT phone FROM employees WHERE first_name = "Nancy" AND last_name = "Edwards";

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

{ 'artists': ['id', 'name'], 'sqlite_sequence': ['name', 'seq'], 'albums': ['id', 'title', 'artist_id'], 'employees': ['id', 'last_name', 'first_name', 'title', 'reports_to', 'birth_date', 'hire_date', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email'], 'customers': ['id', 'first_name', 'last_name', 'company', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email', 'support_rep_id'], 'genres': ['id', 'name'], 'invoices': ['id', 'customer_id', 'invoice_date', 'billing_address', 'billing_city', 'billing_state', 'billing_country', 'billing_postal_code', 'total'], 'media_types': ['id', 'name'], 'tracks': ['id', 'name', 'album_id', 'media_type_id', 'genre_id', 'composer', 'milliseconds', 'bytes', 'unit_price'], 'invoice_lines': ['id', 'invoice_id', 'track_id', 'unit_price', 'quantity'], 'playlists': ['id', 'name'], 'playlist_tracks': ['playlist_id', 'track_id'] }

{ 'employees': ['id', 'last_name', 'first_name', 'phone'] }

TABLE employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.phone (VARCHAR(24)), )

TABLE employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Possible JOINs: employees.reports_to = employees.id

store_1

Who is the youngest employee in the company? List employee's first and last name.

medium

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

SELECT first_name , last_name FROM employees ORDER BY birth_date DESC LIMIT 1;

Table albums ( albums.id (INTEGER), albums.title (VARCHAR(160)), albums.artist_id (INTEGER), ) Table artists ( artists.id (INTEGER), artists.name (VARCHAR(120)), ) Table customers ( customers.id (INTEGER), customers.first_name (VARCHAR(40)), customers.last_name (VARCHAR(20)), customers.company (VARCHAR(80)), customers.address (VARCHAR(70)), customers.city (VARCHAR(40)), customers.state (VARCHAR(40)), customers.country (VARCHAR(40)), customers.postal_code (VARCHAR(10)), customers.phone (VARCHAR(24)), customers.fax (VARCHAR(24)), customers.email (VARCHAR(60)), customers.support_rep_id (INTEGER), ) Table employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Table genres ( genres.id (INTEGER), genres.name (VARCHAR(120)), ) Table invoice_lines ( invoice_lines.id (INTEGER), invoice_lines.invoice_id (INTEGER), invoice_lines.track_id (INTEGER), invoice_lines.unit_price (NUMERIC(10,2)), invoice_lines.quantity (INTEGER), ) Table invoices ( invoices.id (INTEGER), invoices.customer_id (INTEGER), invoices.invoice_date (TIMESTAMP), invoices.billing_address (VARCHAR(70)), invoices.billing_city (VARCHAR(40)), invoices.billing_state (VARCHAR(40)), invoices.billing_country (VARCHAR(40)), invoices.billing_postal_code (VARCHAR(10)), invoices.total (NUMERIC(10,2)), ) Table media_types ( media_types.id (INTEGER), media_types.name (VARCHAR(120)), ) Table playlist_tracks ( playlist_tracks.playlist_id (INTEGER), playlist_tracks.track_id (INTEGER), ) Table playlists ( playlists.id (INTEGER), playlists.name (VARCHAR(120)), ) Table tracks ( tracks.id (INTEGER), tracks.name (VARCHAR(200)), tracks.album_id (INTEGER), tracks.media_type_id (INTEGER), tracks.genre_id (INTEGER), tracks.composer (VARCHAR(220)), tracks.milliseconds (INTEGER), tracks.bytes (INTEGER), tracks.unit_price (NUMERIC(10,2)), ) Possible JOINs: albums.artist_id = artists.id customers.support_rep_id = employees.id employees.reports_to = employees.id invoice_lines.invoice_id = invoices.id invoice_lines.track_id = tracks.id invoices.customer_id = customers.id playlist_tracks.playlist_id = playlists.id playlist_tracks.track_id = tracks.id tracks.album_id = albums.id tracks.media_type_id = media_types.id tracks.genre_id = genres.id

{ 'artists': ['id', 'name'], 'sqlite_sequence': ['name', 'seq'], 'albums': ['id', 'title', 'artist_id'], 'employees': ['id', 'last_name', 'first_name', 'title', 'reports_to', 'birth_date', 'hire_date', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email'], 'customers': ['id', 'first_name', 'last_name', 'company', 'address', 'city', 'state', 'country', 'postal_code', 'phone', 'fax', 'email', 'support_rep_id'], 'genres': ['id', 'name'], 'invoices': ['id', 'customer_id', 'invoice_date', 'billing_address', 'billing_city', 'billing_state', 'billing_country', 'billing_postal_code', 'total'], 'media_types': ['id', 'name'], 'tracks': ['id', 'name', 'album_id', 'media_type_id', 'genre_id', 'composer', 'milliseconds', 'bytes', 'unit_price'], 'invoice_lines': ['id', 'invoice_id', 'track_id', 'unit_price', 'quantity'], 'playlists': ['id', 'name'], 'playlist_tracks': ['playlist_id', 'track_id'] }

{ 'employees': ['id', 'last_name', 'first_name', 'birth_date'] }

TABLE employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.birth_date (TIMESTAMP), )

TABLE employees ( employees.id (INTEGER), employees.last_name (VARCHAR(20)), employees.first_name (VARCHAR(20)), employees.title (VARCHAR(30)), employees.reports_to (INTEGER), employees.birth_date (TIMESTAMP), employees.hire_date (TIMESTAMP), employees.address (VARCHAR(70)), employees.city (VARCHAR(40)), employees.state (VARCHAR(40)), employees.country (VARCHAR(40)), employees.postal_code (VARCHAR(10)), employees.phone (VARCHAR(24)), employees.fax (VARCHAR(24)), employees.email (VARCHAR(60)), ) Possible JOINs: employees.reports_to = employees.id