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CREATE TABLE department (Department_ID number, Name text, Creation text, Ranking number, Budget_in_Billions number, Num_Employees number); CREATE TABLE head (head_ID number, name text, born_state text, age number); CREATE TABLE management (department_ID number, head_ID number, temporary_acting text);

How many heads of the departments are older than 56 ?

SELECT count(*) FROM head WHERE age > 56

easy

CREATE TABLE department (Department_ID number, Name text, Creation text, Ranking number, Budget_in_Billions number, Num_Employees number); CREATE TABLE head (head_ID number, name text, born_state text, age number); CREATE TABLE management (department_ID number, head_ID number, temporary_acting text);

List the name, born state and age of the heads of departments ordered by age.

SELECT name , born_state , age FROM head ORDER BY age

medium

CREATE TABLE department (Department_ID number, Name text, Creation text, Ranking number, Budget_in_Billions number, Num_Employees number); CREATE TABLE head (head_ID number, name text, born_state text, age number); CREATE TABLE management (department_ID number, head_ID number, temporary_acting text);

List the creation year, name and budget of each department.

SELECT creation , name , budget_in_billions FROM department

medium

CREATE TABLE department (Department_ID number, Name text, Creation text, Ranking number, Budget_in_Billions number, Num_Employees number); CREATE TABLE head (head_ID number, name text, born_state text, age number); CREATE TABLE management (department_ID number, head_ID number, temporary_acting text);

What are the maximum and minimum budget of the departments?

SELECT max(budget_in_billions) , min(budget_in_billions) FROM department

medium

CREATE TABLE department (Department_ID number, Name text, Creation text, Ranking number, Budget_in_Billions number, Num_Employees number); CREATE TABLE head (head_ID number, name text, born_state text, age number); CREATE TABLE management (department_ID number, head_ID number, temporary_acting text);

What is the average number of employees of the departments whose rank is between 10 and 15?

SELECT avg(num_employees) FROM department WHERE ranking BETWEEN 10 AND 15

easy

CREATE TABLE department (Department_ID number, Name text, Creation text, Ranking number, Budget_in_Billions number, Num_Employees number); CREATE TABLE head (head_ID number, name text, born_state text, age number); CREATE TABLE management (department_ID number, head_ID number, temporary_acting text);

What are the names of the heads who are born outside the California state?

SELECT name FROM head WHERE born_state != 'California'

easy

CREATE TABLE department (Department_ID number, Name text, Creation text, Ranking number, Budget_in_Billions number, Num_Employees number); CREATE TABLE head (head_ID number, name text, born_state text, age number); CREATE TABLE management (department_ID number, head_ID number, temporary_acting text);

What are the distinct creation years of the departments managed by a secretary born in state 'Alabama'?

SELECT DISTINCT T1.creation FROM department AS T1 JOIN management AS T2 ON T1.department_id = T2.department_id JOIN head AS T3 ON T2.head_id = T3.head_id WHERE T3.born_state = 'Alabama'

hard

CREATE TABLE department (Department_ID number, Name text, Creation text, Ranking number, Budget_in_Billions number, Num_Employees number); CREATE TABLE head (head_ID number, name text, born_state text, age number); CREATE TABLE management (department_ID number, head_ID number, temporary_acting text);

What are the names of the states where at least 3 heads were born?

SELECT born_state FROM head GROUP BY born_state HAVING count(*) >= 3

easy

CREATE TABLE department (Department_ID number, Name text, Creation text, Ranking number, Budget_in_Billions number, Num_Employees number); CREATE TABLE head (head_ID number, name text, born_state text, age number); CREATE TABLE management (department_ID number, head_ID number, temporary_acting text);

In which year were most departments established?

SELECT creation FROM department GROUP BY creation ORDER BY count(*) DESC LIMIT 1

hard

CREATE TABLE department (Department_ID number, Name text, Creation text, Ranking number, Budget_in_Billions number, Num_Employees number); CREATE TABLE head (head_ID number, name text, born_state text, age number); CREATE TABLE management (department_ID number, head_ID number, temporary_acting text);

Show the name and number of employees for the departments managed by heads whose temporary acting value is 'Yes'?

SELECT T1.name , T1.num_employees FROM department AS T1 JOIN management AS T2 ON T1.department_id = T2.department_id WHERE T2.temporary_acting = 'Yes'

medium

CREATE TABLE department (Department_ID number, Name text, Creation text, Ranking number, Budget_in_Billions number, Num_Employees number); CREATE TABLE head (head_ID number, name text, born_state text, age number); CREATE TABLE management (department_ID number, head_ID number, temporary_acting text);

How many acting statuses are there?

SELECT count(DISTINCT temporary_acting) FROM management

easy

CREATE TABLE department (Department_ID number, Name text, Creation text, Ranking number, Budget_in_Billions number, Num_Employees number); CREATE TABLE head (head_ID number, name text, born_state text, age number); CREATE TABLE management (department_ID number, head_ID number, temporary_acting text);

How many departments are led by heads who are not mentioned?

SELECT count(*) FROM department WHERE department_id NOT IN (SELECT department_id FROM management);

extra

CREATE TABLE department (Department_ID number, Name text, Creation text, Ranking number, Budget_in_Billions number, Num_Employees number); CREATE TABLE head (head_ID number, name text, born_state text, age number); CREATE TABLE management (department_ID number, head_ID number, temporary_acting text);

What are the distinct ages of the heads who are acting?

SELECT DISTINCT T1.age FROM management AS T2 JOIN head AS T1 ON T1.head_id = T2.head_id WHERE T2.temporary_acting = 'Yes'

medium

CREATE TABLE department (Department_ID number, Name text, Creation text, Ranking number, Budget_in_Billions number, Num_Employees number); CREATE TABLE head (head_ID number, name text, born_state text, age number); CREATE TABLE management (department_ID number, head_ID number, temporary_acting text);

List the states where both the secretary of 'Treasury' department and the secretary of 'Homeland Security' were born.

SELECT T3.born_state FROM department AS T1 JOIN management AS T2 ON T1.department_id = T2.department_id JOIN head AS T3 ON T2.head_id = T3.head_id WHERE T1.name = 'Treasury' INTERSECT SELECT T3.born_state FROM department AS T1 JOIN management AS T2 ON T1.department_id = T2.department_id JOIN head AS T3 ON T2.head_id = T3.head_id WHERE T1.name = 'Homeland Security'

extra

CREATE TABLE department (Department_ID number, Name text, Creation text, Ranking number, Budget_in_Billions number, Num_Employees number); CREATE TABLE head (head_ID number, name text, born_state text, age number); CREATE TABLE management (department_ID number, head_ID number, temporary_acting text);

Which department has more than 1 head at a time? List the id, name and the number of heads.

SELECT T1.department_id , T1.name , count(*) FROM management AS T2 JOIN department AS T1 ON T1.department_id = T2.department_id GROUP BY T1.department_id HAVING count(*) > 1

medium

CREATE TABLE department (Department_ID number, Name text, Creation text, Ranking number, Budget_in_Billions number, Num_Employees number); CREATE TABLE head (head_ID number, name text, born_state text, age number); CREATE TABLE management (department_ID number, head_ID number, temporary_acting text);

Which head's name has the substring 'Ha'? List the id and name.

SELECT head_id , name FROM head WHERE name LIKE '%Ha%'

medium

CREATE TABLE city (City_ID number, Official_Name text, Status text, Area_km_2 number, Population number, Census_Ranking text); CREATE TABLE farm (Farm_ID number, Year number, Total_Horses number, Working_Horses number, Total_Cattle number, Oxen number, Bulls number, Cows number, Pigs number, Sheep_and_Goats number); CREATE TABLE farm_competition (Competition_ID number, Year number, Theme text, Host_city_ID number, Hosts text); CREATE TABLE competition_record (Competition_ID number, Farm_ID number, Rank number);

How many farms are there?

SELECT count(*) FROM farm

easy

CREATE TABLE city (City_ID number, Official_Name text, Status text, Area_km_2 number, Population number, Census_Ranking text); CREATE TABLE farm (Farm_ID number, Year number, Total_Horses number, Working_Horses number, Total_Cattle number, Oxen number, Bulls number, Cows number, Pigs number, Sheep_and_Goats number); CREATE TABLE farm_competition (Competition_ID number, Year number, Theme text, Host_city_ID number, Hosts text); CREATE TABLE competition_record (Competition_ID number, Farm_ID number, Rank number);

Count the number of farms.

SELECT count(*) FROM farm

easy

CREATE TABLE city (City_ID number, Official_Name text, Status text, Area_km_2 number, Population number, Census_Ranking text); CREATE TABLE farm (Farm_ID number, Year number, Total_Horses number, Working_Horses number, Total_Cattle number, Oxen number, Bulls number, Cows number, Pigs number, Sheep_and_Goats number); CREATE TABLE farm_competition (Competition_ID number, Year number, Theme text, Host_city_ID number, Hosts text); CREATE TABLE competition_record (Competition_ID number, Farm_ID number, Rank number);

List the total number of horses on farms in ascending order.

SELECT Total_Horses FROM farm ORDER BY Total_Horses ASC

easy

CREATE TABLE city (City_ID number, Official_Name text, Status text, Area_km_2 number, Population number, Census_Ranking text); CREATE TABLE farm (Farm_ID number, Year number, Total_Horses number, Working_Horses number, Total_Cattle number, Oxen number, Bulls number, Cows number, Pigs number, Sheep_and_Goats number); CREATE TABLE farm_competition (Competition_ID number, Year number, Theme text, Host_city_ID number, Hosts text); CREATE TABLE competition_record (Competition_ID number, Farm_ID number, Rank number);

What is the total horses record for each farm, sorted ascending?

SELECT Total_Horses FROM farm ORDER BY Total_Horses ASC

easy

CREATE TABLE city (City_ID number, Official_Name text, Status text, Area_km_2 number, Population number, Census_Ranking text); CREATE TABLE farm (Farm_ID number, Year number, Total_Horses number, Working_Horses number, Total_Cattle number, Oxen number, Bulls number, Cows number, Pigs number, Sheep_and_Goats number); CREATE TABLE farm_competition (Competition_ID number, Year number, Theme text, Host_city_ID number, Hosts text); CREATE TABLE competition_record (Competition_ID number, Farm_ID number, Rank number);

What are the hosts of competitions whose theme is not "Aliens"?

SELECT Hosts FROM farm_competition WHERE Theme != 'Aliens'

easy

CREATE TABLE city (City_ID number, Official_Name text, Status text, Area_km_2 number, Population number, Census_Ranking text); CREATE TABLE farm (Farm_ID number, Year number, Total_Horses number, Working_Horses number, Total_Cattle number, Oxen number, Bulls number, Cows number, Pigs number, Sheep_and_Goats number); CREATE TABLE farm_competition (Competition_ID number, Year number, Theme text, Host_city_ID number, Hosts text); CREATE TABLE competition_record (Competition_ID number, Farm_ID number, Rank number);

Return the hosts of competitions for which the theme is not Aliens?

SELECT Hosts FROM farm_competition WHERE Theme != 'Aliens'

easy

CREATE TABLE city (City_ID number, Official_Name text, Status text, Area_km_2 number, Population number, Census_Ranking text); CREATE TABLE farm (Farm_ID number, Year number, Total_Horses number, Working_Horses number, Total_Cattle number, Oxen number, Bulls number, Cows number, Pigs number, Sheep_and_Goats number); CREATE TABLE farm_competition (Competition_ID number, Year number, Theme text, Host_city_ID number, Hosts text); CREATE TABLE competition_record (Competition_ID number, Farm_ID number, Rank number);

What are the themes of farm competitions sorted by year in ascending order?

SELECT Theme FROM farm_competition ORDER BY YEAR ASC

easy

CREATE TABLE city (City_ID number, Official_Name text, Status text, Area_km_2 number, Population number, Census_Ranking text); CREATE TABLE farm (Farm_ID number, Year number, Total_Horses number, Working_Horses number, Total_Cattle number, Oxen number, Bulls number, Cows number, Pigs number, Sheep_and_Goats number); CREATE TABLE farm_competition (Competition_ID number, Year number, Theme text, Host_city_ID number, Hosts text); CREATE TABLE competition_record (Competition_ID number, Farm_ID number, Rank number);

Return the themes of farm competitions, sorted by year ascending.

SELECT Theme FROM farm_competition ORDER BY YEAR ASC

easy

CREATE TABLE city (City_ID number, Official_Name text, Status text, Area_km_2 number, Population number, Census_Ranking text); CREATE TABLE farm (Farm_ID number, Year number, Total_Horses number, Working_Horses number, Total_Cattle number, Oxen number, Bulls number, Cows number, Pigs number, Sheep_and_Goats number); CREATE TABLE farm_competition (Competition_ID number, Year number, Theme text, Host_city_ID number, Hosts text); CREATE TABLE competition_record (Competition_ID number, Farm_ID number, Rank number);

What is the average number of working horses of farms with more than 5000 total number of horses?

SELECT avg(Working_Horses) FROM farm WHERE Total_Horses > 5000

easy

CREATE TABLE city (City_ID number, Official_Name text, Status text, Area_km_2 number, Population number, Census_Ranking text); CREATE TABLE farm (Farm_ID number, Year number, Total_Horses number, Working_Horses number, Total_Cattle number, Oxen number, Bulls number, Cows number, Pigs number, Sheep_and_Goats number); CREATE TABLE farm_competition (Competition_ID number, Year number, Theme text, Host_city_ID number, Hosts text); CREATE TABLE competition_record (Competition_ID number, Farm_ID number, Rank number);

Give the average number of working horses on farms with more than 5000 total horses.

SELECT avg(Working_Horses) FROM farm WHERE Total_Horses > 5000

easy

CREATE TABLE city (City_ID number, Official_Name text, Status text, Area_km_2 number, Population number, Census_Ranking text); CREATE TABLE farm (Farm_ID number, Year number, Total_Horses number, Working_Horses number, Total_Cattle number, Oxen number, Bulls number, Cows number, Pigs number, Sheep_and_Goats number); CREATE TABLE farm_competition (Competition_ID number, Year number, Theme text, Host_city_ID number, Hosts text); CREATE TABLE competition_record (Competition_ID number, Farm_ID number, Rank number);

What are the maximum and minimum number of cows across all farms.

SELECT max(Cows) , min(Cows) FROM farm

medium

CREATE TABLE city (City_ID number, Official_Name text, Status text, Area_km_2 number, Population number, Census_Ranking text); CREATE TABLE farm (Farm_ID number, Year number, Total_Horses number, Working_Horses number, Total_Cattle number, Oxen number, Bulls number, Cows number, Pigs number, Sheep_and_Goats number); CREATE TABLE farm_competition (Competition_ID number, Year number, Theme text, Host_city_ID number, Hosts text); CREATE TABLE competition_record (Competition_ID number, Farm_ID number, Rank number);

Return the maximum and minimum number of cows across all farms.

SELECT max(Cows) , min(Cows) FROM farm

medium

CREATE TABLE city (City_ID number, Official_Name text, Status text, Area_km_2 number, Population number, Census_Ranking text); CREATE TABLE farm (Farm_ID number, Year number, Total_Horses number, Working_Horses number, Total_Cattle number, Oxen number, Bulls number, Cows number, Pigs number, Sheep_and_Goats number); CREATE TABLE farm_competition (Competition_ID number, Year number, Theme text, Host_city_ID number, Hosts text); CREATE TABLE competition_record (Competition_ID number, Farm_ID number, Rank number);

How many different statuses do cities have?

SELECT count(DISTINCT Status) FROM city

easy

CREATE TABLE city (City_ID number, Official_Name text, Status text, Area_km_2 number, Population number, Census_Ranking text); CREATE TABLE farm (Farm_ID number, Year number, Total_Horses number, Working_Horses number, Total_Cattle number, Oxen number, Bulls number, Cows number, Pigs number, Sheep_and_Goats number); CREATE TABLE farm_competition (Competition_ID number, Year number, Theme text, Host_city_ID number, Hosts text); CREATE TABLE competition_record (Competition_ID number, Farm_ID number, Rank number);

Count the number of different statuses.

SELECT count(DISTINCT Status) FROM city

easy

CREATE TABLE city (City_ID number, Official_Name text, Status text, Area_km_2 number, Population number, Census_Ranking text); CREATE TABLE farm (Farm_ID number, Year number, Total_Horses number, Working_Horses number, Total_Cattle number, Oxen number, Bulls number, Cows number, Pigs number, Sheep_and_Goats number); CREATE TABLE farm_competition (Competition_ID number, Year number, Theme text, Host_city_ID number, Hosts text); CREATE TABLE competition_record (Competition_ID number, Farm_ID number, Rank number);

List official names of cities in descending order of population.

SELECT Official_Name FROM city ORDER BY Population DESC

easy

CREATE TABLE city (City_ID number, Official_Name text, Status text, Area_km_2 number, Population number, Census_Ranking text); CREATE TABLE farm (Farm_ID number, Year number, Total_Horses number, Working_Horses number, Total_Cattle number, Oxen number, Bulls number, Cows number, Pigs number, Sheep_and_Goats number); CREATE TABLE farm_competition (Competition_ID number, Year number, Theme text, Host_city_ID number, Hosts text); CREATE TABLE competition_record (Competition_ID number, Farm_ID number, Rank number);

What are the official names of cities, ordered descending by population?

SELECT Official_Name FROM city ORDER BY Population DESC

easy

CREATE TABLE city (City_ID number, Official_Name text, Status text, Area_km_2 number, Population number, Census_Ranking text); CREATE TABLE farm (Farm_ID number, Year number, Total_Horses number, Working_Horses number, Total_Cattle number, Oxen number, Bulls number, Cows number, Pigs number, Sheep_and_Goats number); CREATE TABLE farm_competition (Competition_ID number, Year number, Theme text, Host_city_ID number, Hosts text); CREATE TABLE competition_record (Competition_ID number, Farm_ID number, Rank number);

List the official name and status of the city with the largest population.

SELECT Official_Name , Status FROM city ORDER BY Population DESC LIMIT 1

medium

CREATE TABLE city (City_ID number, Official_Name text, Status text, Area_km_2 number, Population number, Census_Ranking text); CREATE TABLE farm (Farm_ID number, Year number, Total_Horses number, Working_Horses number, Total_Cattle number, Oxen number, Bulls number, Cows number, Pigs number, Sheep_and_Goats number); CREATE TABLE farm_competition (Competition_ID number, Year number, Theme text, Host_city_ID number, Hosts text); CREATE TABLE competition_record (Competition_ID number, Farm_ID number, Rank number);

What is the official name and status of the city with the most residents?

SELECT Official_Name , Status FROM city ORDER BY Population DESC LIMIT 1

medium

CREATE TABLE city (City_ID number, Official_Name text, Status text, Area_km_2 number, Population number, Census_Ranking text); CREATE TABLE farm (Farm_ID number, Year number, Total_Horses number, Working_Horses number, Total_Cattle number, Oxen number, Bulls number, Cows number, Pigs number, Sheep_and_Goats number); CREATE TABLE farm_competition (Competition_ID number, Year number, Theme text, Host_city_ID number, Hosts text); CREATE TABLE competition_record (Competition_ID number, Farm_ID number, Rank number);

Show the years and the official names of the host cities of competitions.

SELECT T2.Year , T1.Official_Name FROM city AS T1 JOIN farm_competition AS T2 ON T1.City_ID = T2.Host_city_ID

medium

CREATE TABLE city (City_ID number, Official_Name text, Status text, Area_km_2 number, Population number, Census_Ranking text); CREATE TABLE farm (Farm_ID number, Year number, Total_Horses number, Working_Horses number, Total_Cattle number, Oxen number, Bulls number, Cows number, Pigs number, Sheep_and_Goats number); CREATE TABLE farm_competition (Competition_ID number, Year number, Theme text, Host_city_ID number, Hosts text); CREATE TABLE competition_record (Competition_ID number, Farm_ID number, Rank number);

Give the years and official names of the cities of each competition.

SELECT T2.Year , T1.Official_Name FROM city AS T1 JOIN farm_competition AS T2 ON T1.City_ID = T2.Host_city_ID

medium

CREATE TABLE city (City_ID number, Official_Name text, Status text, Area_km_2 number, Population number, Census_Ranking text); CREATE TABLE farm (Farm_ID number, Year number, Total_Horses number, Working_Horses number, Total_Cattle number, Oxen number, Bulls number, Cows number, Pigs number, Sheep_and_Goats number); CREATE TABLE farm_competition (Competition_ID number, Year number, Theme text, Host_city_ID number, Hosts text); CREATE TABLE competition_record (Competition_ID number, Farm_ID number, Rank number);

Show the official names of the cities that have hosted more than one competition.

SELECT T1.Official_Name FROM city AS T1 JOIN farm_competition AS T2 ON T1.City_ID = T2.Host_city_ID GROUP BY T2.Host_city_ID HAVING COUNT(*) > 1

medium

CREATE TABLE city (City_ID number, Official_Name text, Status text, Area_km_2 number, Population number, Census_Ranking text); CREATE TABLE farm (Farm_ID number, Year number, Total_Horses number, Working_Horses number, Total_Cattle number, Oxen number, Bulls number, Cows number, Pigs number, Sheep_and_Goats number); CREATE TABLE farm_competition (Competition_ID number, Year number, Theme text, Host_city_ID number, Hosts text); CREATE TABLE competition_record (Competition_ID number, Farm_ID number, Rank number);

What are the official names of cities that have hosted more than one competition?

SELECT T1.Official_Name FROM city AS T1 JOIN farm_competition AS T2 ON T1.City_ID = T2.Host_city_ID GROUP BY T2.Host_city_ID HAVING COUNT(*) > 1

medium

CREATE TABLE city (City_ID number, Official_Name text, Status text, Area_km_2 number, Population number, Census_Ranking text); CREATE TABLE farm (Farm_ID number, Year number, Total_Horses number, Working_Horses number, Total_Cattle number, Oxen number, Bulls number, Cows number, Pigs number, Sheep_and_Goats number); CREATE TABLE farm_competition (Competition_ID number, Year number, Theme text, Host_city_ID number, Hosts text); CREATE TABLE competition_record (Competition_ID number, Farm_ID number, Rank number);

Show the status of the city that has hosted the greatest number of competitions.

SELECT T1.Status FROM city AS T1 JOIN farm_competition AS T2 ON T1.City_ID = T2.Host_city_ID GROUP BY T2.Host_city_ID ORDER BY COUNT(*) DESC LIMIT 1

extra

CREATE TABLE city (City_ID number, Official_Name text, Status text, Area_km_2 number, Population number, Census_Ranking text); CREATE TABLE farm (Farm_ID number, Year number, Total_Horses number, Working_Horses number, Total_Cattle number, Oxen number, Bulls number, Cows number, Pigs number, Sheep_and_Goats number); CREATE TABLE farm_competition (Competition_ID number, Year number, Theme text, Host_city_ID number, Hosts text); CREATE TABLE competition_record (Competition_ID number, Farm_ID number, Rank number);

What is the status of the city that has hosted the most competitions?

SELECT T1.Status FROM city AS T1 JOIN farm_competition AS T2 ON T1.City_ID = T2.Host_city_ID GROUP BY T2.Host_city_ID ORDER BY COUNT(*) DESC LIMIT 1

extra

CREATE TABLE city (City_ID number, Official_Name text, Status text, Area_km_2 number, Population number, Census_Ranking text); CREATE TABLE farm (Farm_ID number, Year number, Total_Horses number, Working_Horses number, Total_Cattle number, Oxen number, Bulls number, Cows number, Pigs number, Sheep_and_Goats number); CREATE TABLE farm_competition (Competition_ID number, Year number, Theme text, Host_city_ID number, Hosts text); CREATE TABLE competition_record (Competition_ID number, Farm_ID number, Rank number);

Please show the themes of competitions with host cities having populations larger than 1000.

SELECT T2.Theme FROM city AS T1 JOIN farm_competition AS T2 ON T1.City_ID = T2.Host_city_ID WHERE T1.Population > 1000

medium

CREATE TABLE city (City_ID number, Official_Name text, Status text, Area_km_2 number, Population number, Census_Ranking text); CREATE TABLE farm (Farm_ID number, Year number, Total_Horses number, Working_Horses number, Total_Cattle number, Oxen number, Bulls number, Cows number, Pigs number, Sheep_and_Goats number); CREATE TABLE farm_competition (Competition_ID number, Year number, Theme text, Host_city_ID number, Hosts text); CREATE TABLE competition_record (Competition_ID number, Farm_ID number, Rank number);

What are the themes of competitions that have corresponding host cities with more than 1000 residents?

SELECT T2.Theme FROM city AS T1 JOIN farm_competition AS T2 ON T1.City_ID = T2.Host_city_ID WHERE T1.Population > 1000

medium

CREATE TABLE city (City_ID number, Official_Name text, Status text, Area_km_2 number, Population number, Census_Ranking text); CREATE TABLE farm (Farm_ID number, Year number, Total_Horses number, Working_Horses number, Total_Cattle number, Oxen number, Bulls number, Cows number, Pigs number, Sheep_and_Goats number); CREATE TABLE farm_competition (Competition_ID number, Year number, Theme text, Host_city_ID number, Hosts text); CREATE TABLE competition_record (Competition_ID number, Farm_ID number, Rank number);

Please show the different statuses of cities and the average population of cities with each status.

SELECT Status , avg(Population) FROM city GROUP BY Status

medium

CREATE TABLE city (City_ID number, Official_Name text, Status text, Area_km_2 number, Population number, Census_Ranking text); CREATE TABLE farm (Farm_ID number, Year number, Total_Horses number, Working_Horses number, Total_Cattle number, Oxen number, Bulls number, Cows number, Pigs number, Sheep_and_Goats number); CREATE TABLE farm_competition (Competition_ID number, Year number, Theme text, Host_city_ID number, Hosts text); CREATE TABLE competition_record (Competition_ID number, Farm_ID number, Rank number);

What are the statuses and average populations of each city?

SELECT Status , avg(Population) FROM city GROUP BY Status

medium

CREATE TABLE city (City_ID number, Official_Name text, Status text, Area_km_2 number, Population number, Census_Ranking text); CREATE TABLE farm (Farm_ID number, Year number, Total_Horses number, Working_Horses number, Total_Cattle number, Oxen number, Bulls number, Cows number, Pigs number, Sheep_and_Goats number); CREATE TABLE farm_competition (Competition_ID number, Year number, Theme text, Host_city_ID number, Hosts text); CREATE TABLE competition_record (Competition_ID number, Farm_ID number, Rank number);

Please show the different statuses, ordered by the number of cities that have each.

SELECT Status FROM city GROUP BY Status ORDER BY COUNT(*) ASC

medium

CREATE TABLE city (City_ID number, Official_Name text, Status text, Area_km_2 number, Population number, Census_Ranking text); CREATE TABLE farm (Farm_ID number, Year number, Total_Horses number, Working_Horses number, Total_Cattle number, Oxen number, Bulls number, Cows number, Pigs number, Sheep_and_Goats number); CREATE TABLE farm_competition (Competition_ID number, Year number, Theme text, Host_city_ID number, Hosts text); CREATE TABLE competition_record (Competition_ID number, Farm_ID number, Rank number);

Return the different statuses of cities, ascending by frequency.

SELECT Status FROM city GROUP BY Status ORDER BY COUNT(*) ASC

medium

CREATE TABLE city (City_ID number, Official_Name text, Status text, Area_km_2 number, Population number, Census_Ranking text); CREATE TABLE farm (Farm_ID number, Year number, Total_Horses number, Working_Horses number, Total_Cattle number, Oxen number, Bulls number, Cows number, Pigs number, Sheep_and_Goats number); CREATE TABLE farm_competition (Competition_ID number, Year number, Theme text, Host_city_ID number, Hosts text); CREATE TABLE competition_record (Competition_ID number, Farm_ID number, Rank number);

List the most common type of Status across cities.

SELECT Status FROM city GROUP BY Status ORDER BY COUNT(*) DESC LIMIT 1

hard

CREATE TABLE city (City_ID number, Official_Name text, Status text, Area_km_2 number, Population number, Census_Ranking text); CREATE TABLE farm (Farm_ID number, Year number, Total_Horses number, Working_Horses number, Total_Cattle number, Oxen number, Bulls number, Cows number, Pigs number, Sheep_and_Goats number); CREATE TABLE farm_competition (Competition_ID number, Year number, Theme text, Host_city_ID number, Hosts text); CREATE TABLE competition_record (Competition_ID number, Farm_ID number, Rank number);

What is the most common status across all cities?

SELECT Status FROM city GROUP BY Status ORDER BY COUNT(*) DESC LIMIT 1

hard

CREATE TABLE city (City_ID number, Official_Name text, Status text, Area_km_2 number, Population number, Census_Ranking text); CREATE TABLE farm (Farm_ID number, Year number, Total_Horses number, Working_Horses number, Total_Cattle number, Oxen number, Bulls number, Cows number, Pigs number, Sheep_and_Goats number); CREATE TABLE farm_competition (Competition_ID number, Year number, Theme text, Host_city_ID number, Hosts text); CREATE TABLE competition_record (Competition_ID number, Farm_ID number, Rank number);

List the official names of cities that have not held any competition.

SELECT Official_Name FROM city WHERE City_ID NOT IN (SELECT Host_city_ID FROM farm_competition)

hard

CREATE TABLE city (City_ID number, Official_Name text, Status text, Area_km_2 number, Population number, Census_Ranking text); CREATE TABLE farm (Farm_ID number, Year number, Total_Horses number, Working_Horses number, Total_Cattle number, Oxen number, Bulls number, Cows number, Pigs number, Sheep_and_Goats number); CREATE TABLE farm_competition (Competition_ID number, Year number, Theme text, Host_city_ID number, Hosts text); CREATE TABLE competition_record (Competition_ID number, Farm_ID number, Rank number);

What are the official names of cities that have not hosted a farm competition?

SELECT Official_Name FROM city WHERE City_ID NOT IN (SELECT Host_city_ID FROM farm_competition)

hard

CREATE TABLE city (City_ID number, Official_Name text, Status text, Area_km_2 number, Population number, Census_Ranking text); CREATE TABLE farm (Farm_ID number, Year number, Total_Horses number, Working_Horses number, Total_Cattle number, Oxen number, Bulls number, Cows number, Pigs number, Sheep_and_Goats number); CREATE TABLE farm_competition (Competition_ID number, Year number, Theme text, Host_city_ID number, Hosts text); CREATE TABLE competition_record (Competition_ID number, Farm_ID number, Rank number);

Show the status shared by cities with population bigger than 1500 and smaller than 500.

SELECT Status FROM city WHERE Population > 1500 INTERSECT SELECT Status FROM city WHERE Population < 500

hard

CREATE TABLE city (City_ID number, Official_Name text, Status text, Area_km_2 number, Population number, Census_Ranking text); CREATE TABLE farm (Farm_ID number, Year number, Total_Horses number, Working_Horses number, Total_Cattle number, Oxen number, Bulls number, Cows number, Pigs number, Sheep_and_Goats number); CREATE TABLE farm_competition (Competition_ID number, Year number, Theme text, Host_city_ID number, Hosts text); CREATE TABLE competition_record (Competition_ID number, Farm_ID number, Rank number);

Which statuses correspond to both cities that have a population over 1500 and cities that have a population lower than 500?

SELECT Status FROM city WHERE Population > 1500 INTERSECT SELECT Status FROM city WHERE Population < 500

hard

CREATE TABLE city (City_ID number, Official_Name text, Status text, Area_km_2 number, Population number, Census_Ranking text); CREATE TABLE farm (Farm_ID number, Year number, Total_Horses number, Working_Horses number, Total_Cattle number, Oxen number, Bulls number, Cows number, Pigs number, Sheep_and_Goats number); CREATE TABLE farm_competition (Competition_ID number, Year number, Theme text, Host_city_ID number, Hosts text); CREATE TABLE competition_record (Competition_ID number, Farm_ID number, Rank number);

Find the official names of cities with population bigger than 1500 or smaller than 500.

SELECT Official_Name FROM city WHERE Population > 1500 OR Population < 500

medium

CREATE TABLE city (City_ID number, Official_Name text, Status text, Area_km_2 number, Population number, Census_Ranking text); CREATE TABLE farm (Farm_ID number, Year number, Total_Horses number, Working_Horses number, Total_Cattle number, Oxen number, Bulls number, Cows number, Pigs number, Sheep_and_Goats number); CREATE TABLE farm_competition (Competition_ID number, Year number, Theme text, Host_city_ID number, Hosts text); CREATE TABLE competition_record (Competition_ID number, Farm_ID number, Rank number);

What are the official names of cities that have population over 1500 or less than 500?

SELECT Official_Name FROM city WHERE Population > 1500 OR Population < 500

medium

CREATE TABLE city (City_ID number, Official_Name text, Status text, Area_km_2 number, Population number, Census_Ranking text); CREATE TABLE farm (Farm_ID number, Year number, Total_Horses number, Working_Horses number, Total_Cattle number, Oxen number, Bulls number, Cows number, Pigs number, Sheep_and_Goats number); CREATE TABLE farm_competition (Competition_ID number, Year number, Theme text, Host_city_ID number, Hosts text); CREATE TABLE competition_record (Competition_ID number, Farm_ID number, Rank number);

Show the census ranking of cities whose status are not "Village".

SELECT Census_Ranking FROM city WHERE Status != "Village"

easy

CREATE TABLE city (City_ID number, Official_Name text, Status text, Area_km_2 number, Population number, Census_Ranking text); CREATE TABLE farm (Farm_ID number, Year number, Total_Horses number, Working_Horses number, Total_Cattle number, Oxen number, Bulls number, Cows number, Pigs number, Sheep_and_Goats number); CREATE TABLE farm_competition (Competition_ID number, Year number, Theme text, Host_city_ID number, Hosts text); CREATE TABLE competition_record (Competition_ID number, Farm_ID number, Rank number);

What are the census rankings of cities that do not have the status "Village"?

SELECT Census_Ranking FROM city WHERE Status != "Village"

easy

CREATE TABLE Addresses (address_id number, line_1 text, line_2 text, city text, zip_postcode text, state_province_county text, country text); CREATE TABLE People (person_id number, first_name text, middle_name text, last_name text, cell_mobile_number text, email_address text, login_name text, password text); CREATE TABLE Students (student_id number, student_details text); CREATE TABLE Courses (course_id text, course_name text, course_description text, other_details text); CREATE TABLE People_Addresses (person_address_id number, person_id number, address_id number, date_from time, date_to time); CREATE TABLE Student_Course_Registrations (student_id number, course_id number, registration_date time); CREATE TABLE Student_Course_Attendance (student_id number, course_id number, date_of_attendance time); CREATE TABLE Candidates (candidate_id number, candidate_details text); CREATE TABLE Candidate_Assessments (candidate_id number, qualification text, assessment_date time, asessment_outcome_code text);

which course has most number of registered students?

SELECT T1.course_name FROM courses AS T1 JOIN student_course_registrations AS T2 ON T1.course_id = T2.course_Id GROUP BY T1.course_id ORDER BY count(*) DESC LIMIT 1

extra

CREATE TABLE Addresses (address_id number, line_1 text, line_2 text, city text, zip_postcode text, state_province_county text, country text); CREATE TABLE People (person_id number, first_name text, middle_name text, last_name text, cell_mobile_number text, email_address text, login_name text, password text); CREATE TABLE Students (student_id number, student_details text); CREATE TABLE Courses (course_id text, course_name text, course_description text, other_details text); CREATE TABLE People_Addresses (person_address_id number, person_id number, address_id number, date_from time, date_to time); CREATE TABLE Student_Course_Registrations (student_id number, course_id number, registration_date time); CREATE TABLE Student_Course_Attendance (student_id number, course_id number, date_of_attendance time); CREATE TABLE Candidates (candidate_id number, candidate_details text); CREATE TABLE Candidate_Assessments (candidate_id number, qualification text, assessment_date time, asessment_outcome_code text);

What is the name of the course with the most registered students?

SELECT T1.course_name FROM courses AS T1 JOIN student_course_registrations AS T2 ON T1.course_id = T2.course_Id GROUP BY T1.course_id ORDER BY count(*) DESC LIMIT 1

extra

CREATE TABLE Addresses (address_id number, line_1 text, line_2 text, city text, zip_postcode text, state_province_county text, country text); CREATE TABLE People (person_id number, first_name text, middle_name text, last_name text, cell_mobile_number text, email_address text, login_name text, password text); CREATE TABLE Students (student_id number, student_details text); CREATE TABLE Courses (course_id text, course_name text, course_description text, other_details text); CREATE TABLE People_Addresses (person_address_id number, person_id number, address_id number, date_from time, date_to time); CREATE TABLE Student_Course_Registrations (student_id number, course_id number, registration_date time); CREATE TABLE Student_Course_Attendance (student_id number, course_id number, date_of_attendance time); CREATE TABLE Candidates (candidate_id number, candidate_details text); CREATE TABLE Candidate_Assessments (candidate_id number, qualification text, assessment_date time, asessment_outcome_code text);

what is id of students who registered some courses but the least number of courses in these students?

SELECT student_id FROM student_course_registrations GROUP BY student_id ORDER BY count(*) LIMIT 1

hard

CREATE TABLE Addresses (address_id number, line_1 text, line_2 text, city text, zip_postcode text, state_province_county text, country text); CREATE TABLE People (person_id number, first_name text, middle_name text, last_name text, cell_mobile_number text, email_address text, login_name text, password text); CREATE TABLE Students (student_id number, student_details text); CREATE TABLE Courses (course_id text, course_name text, course_description text, other_details text); CREATE TABLE People_Addresses (person_address_id number, person_id number, address_id number, date_from time, date_to time); CREATE TABLE Student_Course_Registrations (student_id number, course_id number, registration_date time); CREATE TABLE Student_Course_Attendance (student_id number, course_id number, date_of_attendance time); CREATE TABLE Candidates (candidate_id number, candidate_details text); CREATE TABLE Candidate_Assessments (candidate_id number, qualification text, assessment_date time, asessment_outcome_code text);

What are the ids of the students who registered for some courses but had the least number of courses for all students?

SELECT student_id FROM student_course_registrations GROUP BY student_id ORDER BY count(*) LIMIT 1

hard

CREATE TABLE Addresses (address_id number, line_1 text, line_2 text, city text, zip_postcode text, state_province_county text, country text); CREATE TABLE People (person_id number, first_name text, middle_name text, last_name text, cell_mobile_number text, email_address text, login_name text, password text); CREATE TABLE Students (student_id number, student_details text); CREATE TABLE Courses (course_id text, course_name text, course_description text, other_details text); CREATE TABLE People_Addresses (person_address_id number, person_id number, address_id number, date_from time, date_to time); CREATE TABLE Student_Course_Registrations (student_id number, course_id number, registration_date time); CREATE TABLE Student_Course_Attendance (student_id number, course_id number, date_of_attendance time); CREATE TABLE Candidates (candidate_id number, candidate_details text); CREATE TABLE Candidate_Assessments (candidate_id number, qualification text, assessment_date time, asessment_outcome_code text);

what are the first name and last name of all candidates?

SELECT T2.first_name , T2.last_name FROM candidates AS T1 JOIN people AS T2 ON T1.candidate_id = T2.person_id

medium

CREATE TABLE Addresses (address_id number, line_1 text, line_2 text, city text, zip_postcode text, state_province_county text, country text); CREATE TABLE People (person_id number, first_name text, middle_name text, last_name text, cell_mobile_number text, email_address text, login_name text, password text); CREATE TABLE Students (student_id number, student_details text); CREATE TABLE Courses (course_id text, course_name text, course_description text, other_details text); CREATE TABLE People_Addresses (person_address_id number, person_id number, address_id number, date_from time, date_to time); CREATE TABLE Student_Course_Registrations (student_id number, course_id number, registration_date time); CREATE TABLE Student_Course_Attendance (student_id number, course_id number, date_of_attendance time); CREATE TABLE Candidates (candidate_id number, candidate_details text); CREATE TABLE Candidate_Assessments (candidate_id number, qualification text, assessment_date time, asessment_outcome_code text);

What are the first and last names of all the candidates?

SELECT T2.first_name , T2.last_name FROM candidates AS T1 JOIN people AS T2 ON T1.candidate_id = T2.person_id

medium

CREATE TABLE Addresses (address_id number, line_1 text, line_2 text, city text, zip_postcode text, state_province_county text, country text); CREATE TABLE People (person_id number, first_name text, middle_name text, last_name text, cell_mobile_number text, email_address text, login_name text, password text); CREATE TABLE Students (student_id number, student_details text); CREATE TABLE Courses (course_id text, course_name text, course_description text, other_details text); CREATE TABLE People_Addresses (person_address_id number, person_id number, address_id number, date_from time, date_to time); CREATE TABLE Student_Course_Registrations (student_id number, course_id number, registration_date time); CREATE TABLE Student_Course_Attendance (student_id number, course_id number, date_of_attendance time); CREATE TABLE Candidates (candidate_id number, candidate_details text); CREATE TABLE Candidate_Assessments (candidate_id number, qualification text, assessment_date time, asessment_outcome_code text);

List the id of students who never attends courses?

SELECT student_id FROM students WHERE student_id NOT IN (SELECT student_id FROM student_course_attendance)

hard

CREATE TABLE Addresses (address_id number, line_1 text, line_2 text, city text, zip_postcode text, state_province_county text, country text); CREATE TABLE People (person_id number, first_name text, middle_name text, last_name text, cell_mobile_number text, email_address text, login_name text, password text); CREATE TABLE Students (student_id number, student_details text); CREATE TABLE Courses (course_id text, course_name text, course_description text, other_details text); CREATE TABLE People_Addresses (person_address_id number, person_id number, address_id number, date_from time, date_to time); CREATE TABLE Student_Course_Registrations (student_id number, course_id number, registration_date time); CREATE TABLE Student_Course_Attendance (student_id number, course_id number, date_of_attendance time); CREATE TABLE Candidates (candidate_id number, candidate_details text); CREATE TABLE Candidate_Assessments (candidate_id number, qualification text, assessment_date time, asessment_outcome_code text);

What are the ids of every student who has never attended a course?

SELECT student_id FROM students WHERE student_id NOT IN (SELECT student_id FROM student_course_attendance)

hard

CREATE TABLE Addresses (address_id number, line_1 text, line_2 text, city text, zip_postcode text, state_province_county text, country text); CREATE TABLE People (person_id number, first_name text, middle_name text, last_name text, cell_mobile_number text, email_address text, login_name text, password text); CREATE TABLE Students (student_id number, student_details text); CREATE TABLE Courses (course_id text, course_name text, course_description text, other_details text); CREATE TABLE People_Addresses (person_address_id number, person_id number, address_id number, date_from time, date_to time); CREATE TABLE Student_Course_Registrations (student_id number, course_id number, registration_date time); CREATE TABLE Student_Course_Attendance (student_id number, course_id number, date_of_attendance time); CREATE TABLE Candidates (candidate_id number, candidate_details text); CREATE TABLE Candidate_Assessments (candidate_id number, qualification text, assessment_date time, asessment_outcome_code text);

List the id of students who attended some courses?

SELECT student_id FROM student_course_attendance

easy

CREATE TABLE Addresses (address_id number, line_1 text, line_2 text, city text, zip_postcode text, state_province_county text, country text); CREATE TABLE People (person_id number, first_name text, middle_name text, last_name text, cell_mobile_number text, email_address text, login_name text, password text); CREATE TABLE Students (student_id number, student_details text); CREATE TABLE Courses (course_id text, course_name text, course_description text, other_details text); CREATE TABLE People_Addresses (person_address_id number, person_id number, address_id number, date_from time, date_to time); CREATE TABLE Student_Course_Registrations (student_id number, course_id number, registration_date time); CREATE TABLE Student_Course_Attendance (student_id number, course_id number, date_of_attendance time); CREATE TABLE Candidates (candidate_id number, candidate_details text); CREATE TABLE Candidate_Assessments (candidate_id number, qualification text, assessment_date time, asessment_outcome_code text);

What are the ids of all students who have attended at least one course?

SELECT student_id FROM student_course_attendance

easy

CREATE TABLE Addresses (address_id number, line_1 text, line_2 text, city text, zip_postcode text, state_province_county text, country text); CREATE TABLE People (person_id number, first_name text, middle_name text, last_name text, cell_mobile_number text, email_address text, login_name text, password text); CREATE TABLE Students (student_id number, student_details text); CREATE TABLE Courses (course_id text, course_name text, course_description text, other_details text); CREATE TABLE People_Addresses (person_address_id number, person_id number, address_id number, date_from time, date_to time); CREATE TABLE Student_Course_Registrations (student_id number, course_id number, registration_date time); CREATE TABLE Student_Course_Attendance (student_id number, course_id number, date_of_attendance time); CREATE TABLE Candidates (candidate_id number, candidate_details text); CREATE TABLE Candidate_Assessments (candidate_id number, qualification text, assessment_date time, asessment_outcome_code text);

What are the ids of all students for courses and what are the names of those courses?

SELECT T1.student_id , T2.course_name FROM student_course_registrations AS T1 JOIN courses AS T2 ON T1.course_id = T2.course_id

medium

CREATE TABLE Addresses (address_id number, line_1 text, line_2 text, city text, zip_postcode text, state_province_county text, country text); CREATE TABLE People (person_id number, first_name text, middle_name text, last_name text, cell_mobile_number text, email_address text, login_name text, password text); CREATE TABLE Students (student_id number, student_details text); CREATE TABLE Courses (course_id text, course_name text, course_description text, other_details text); CREATE TABLE People_Addresses (person_address_id number, person_id number, address_id number, date_from time, date_to time); CREATE TABLE Student_Course_Registrations (student_id number, course_id number, registration_date time); CREATE TABLE Student_Course_Attendance (student_id number, course_id number, date_of_attendance time); CREATE TABLE Candidates (candidate_id number, candidate_details text); CREATE TABLE Candidate_Assessments (candidate_id number, qualification text, assessment_date time, asessment_outcome_code text);

What is detail of the student who most recently registered course?

SELECT T2.student_details FROM student_course_registrations AS T1 JOIN students AS T2 ON T1.student_id = T2.student_id ORDER BY T1.registration_date DESC LIMIT 1

hard

CREATE TABLE Addresses (address_id number, line_1 text, line_2 text, city text, zip_postcode text, state_province_county text, country text); CREATE TABLE People (person_id number, first_name text, middle_name text, last_name text, cell_mobile_number text, email_address text, login_name text, password text); CREATE TABLE Students (student_id number, student_details text); CREATE TABLE Courses (course_id text, course_name text, course_description text, other_details text); CREATE TABLE People_Addresses (person_address_id number, person_id number, address_id number, date_from time, date_to time); CREATE TABLE Student_Course_Registrations (student_id number, course_id number, registration_date time); CREATE TABLE Student_Course_Attendance (student_id number, course_id number, date_of_attendance time); CREATE TABLE Candidates (candidate_id number, candidate_details text); CREATE TABLE Candidate_Assessments (candidate_id number, qualification text, assessment_date time, asessment_outcome_code text);

What details do we have on the students who registered for courses most recently?

SELECT T2.student_details FROM student_course_registrations AS T1 JOIN students AS T2 ON T1.student_id = T2.student_id ORDER BY T1.registration_date DESC LIMIT 1

hard

CREATE TABLE Addresses (address_id number, line_1 text, line_2 text, city text, zip_postcode text, state_province_county text, country text); CREATE TABLE People (person_id number, first_name text, middle_name text, last_name text, cell_mobile_number text, email_address text, login_name text, password text); CREATE TABLE Students (student_id number, student_details text); CREATE TABLE Courses (course_id text, course_name text, course_description text, other_details text); CREATE TABLE People_Addresses (person_address_id number, person_id number, address_id number, date_from time, date_to time); CREATE TABLE Student_Course_Registrations (student_id number, course_id number, registration_date time); CREATE TABLE Student_Course_Attendance (student_id number, course_id number, date_of_attendance time); CREATE TABLE Candidates (candidate_id number, candidate_details text); CREATE TABLE Candidate_Assessments (candidate_id number, qualification text, assessment_date time, asessment_outcome_code text);

How many students attend course English?

SELECT count(*) FROM courses AS T1 JOIN student_course_attendance AS T2 ON T1.course_id = T2.course_id WHERE T1.course_name = "English"

medium

CREATE TABLE Addresses (address_id number, line_1 text, line_2 text, city text, zip_postcode text, state_province_county text, country text); CREATE TABLE People (person_id number, first_name text, middle_name text, last_name text, cell_mobile_number text, email_address text, login_name text, password text); CREATE TABLE Students (student_id number, student_details text); CREATE TABLE Courses (course_id text, course_name text, course_description text, other_details text); CREATE TABLE People_Addresses (person_address_id number, person_id number, address_id number, date_from time, date_to time); CREATE TABLE Student_Course_Registrations (student_id number, course_id number, registration_date time); CREATE TABLE Student_Course_Attendance (student_id number, course_id number, date_of_attendance time); CREATE TABLE Candidates (candidate_id number, candidate_details text); CREATE TABLE Candidate_Assessments (candidate_id number, qualification text, assessment_date time, asessment_outcome_code text);

How many students are attending English courses?

SELECT count(*) FROM courses AS T1 JOIN student_course_attendance AS T2 ON T1.course_id = T2.course_id WHERE T1.course_name = "English"

medium

CREATE TABLE Addresses (address_id number, line_1 text, line_2 text, city text, zip_postcode text, state_province_county text, country text); CREATE TABLE People (person_id number, first_name text, middle_name text, last_name text, cell_mobile_number text, email_address text, login_name text, password text); CREATE TABLE Students (student_id number, student_details text); CREATE TABLE Courses (course_id text, course_name text, course_description text, other_details text); CREATE TABLE People_Addresses (person_address_id number, person_id number, address_id number, date_from time, date_to time); CREATE TABLE Student_Course_Registrations (student_id number, course_id number, registration_date time); CREATE TABLE Student_Course_Attendance (student_id number, course_id number, date_of_attendance time); CREATE TABLE Candidates (candidate_id number, candidate_details text); CREATE TABLE Candidate_Assessments (candidate_id number, qualification text, assessment_date time, asessment_outcome_code text);

How many courses do the student whose id is 171 attend?

SELECT count(*) FROM courses AS T1 JOIN student_course_attendance AS T2 ON T1.course_id = T2.course_id WHERE T2.student_id = 171

medium

CREATE TABLE Addresses (address_id number, line_1 text, line_2 text, city text, zip_postcode text, state_province_county text, country text); CREATE TABLE People (person_id number, first_name text, middle_name text, last_name text, cell_mobile_number text, email_address text, login_name text, password text); CREATE TABLE Students (student_id number, student_details text); CREATE TABLE Courses (course_id text, course_name text, course_description text, other_details text); CREATE TABLE People_Addresses (person_address_id number, person_id number, address_id number, date_from time, date_to time); CREATE TABLE Student_Course_Registrations (student_id number, course_id number, registration_date time); CREATE TABLE Student_Course_Attendance (student_id number, course_id number, date_of_attendance time); CREATE TABLE Candidates (candidate_id number, candidate_details text); CREATE TABLE Candidate_Assessments (candidate_id number, qualification text, assessment_date time, asessment_outcome_code text);

How many courses does the student with id 171 actually attend?

SELECT count(*) FROM courses AS T1 JOIN student_course_attendance AS T2 ON T1.course_id = T2.course_id WHERE T2.student_id = 171

medium

CREATE TABLE Addresses (address_id number, line_1 text, line_2 text, city text, zip_postcode text, state_province_county text, country text); CREATE TABLE People (person_id number, first_name text, middle_name text, last_name text, cell_mobile_number text, email_address text, login_name text, password text); CREATE TABLE Students (student_id number, student_details text); CREATE TABLE Courses (course_id text, course_name text, course_description text, other_details text); CREATE TABLE People_Addresses (person_address_id number, person_id number, address_id number, date_from time, date_to time); CREATE TABLE Student_Course_Registrations (student_id number, course_id number, registration_date time); CREATE TABLE Student_Course_Attendance (student_id number, course_id number, date_of_attendance time); CREATE TABLE Candidates (candidate_id number, candidate_details text); CREATE TABLE Candidate_Assessments (candidate_id number, qualification text, assessment_date time, asessment_outcome_code text);

Find id of the candidate whose email is stanley.monahan@example.org?

SELECT T2.candidate_id FROM people AS T1 JOIN candidates AS T2 ON T1.person_id = T2.candidate_id WHERE T1.email_address = "stanley.monahan@example.org"

medium

CREATE TABLE Addresses (address_id number, line_1 text, line_2 text, city text, zip_postcode text, state_province_county text, country text); CREATE TABLE People (person_id number, first_name text, middle_name text, last_name text, cell_mobile_number text, email_address text, login_name text, password text); CREATE TABLE Students (student_id number, student_details text); CREATE TABLE Courses (course_id text, course_name text, course_description text, other_details text); CREATE TABLE People_Addresses (person_address_id number, person_id number, address_id number, date_from time, date_to time); CREATE TABLE Student_Course_Registrations (student_id number, course_id number, registration_date time); CREATE TABLE Student_Course_Attendance (student_id number, course_id number, date_of_attendance time); CREATE TABLE Candidates (candidate_id number, candidate_details text); CREATE TABLE Candidate_Assessments (candidate_id number, qualification text, assessment_date time, asessment_outcome_code text);

What is the id of the candidate whose email is stanley.monahan@example.org?

SELECT T2.candidate_id FROM people AS T1 JOIN candidates AS T2 ON T1.person_id = T2.candidate_id WHERE T1.email_address = "stanley.monahan@example.org"

medium

CREATE TABLE Addresses (address_id number, line_1 text, line_2 text, city text, zip_postcode text, state_province_county text, country text); CREATE TABLE People (person_id number, first_name text, middle_name text, last_name text, cell_mobile_number text, email_address text, login_name text, password text); CREATE TABLE Students (student_id number, student_details text); CREATE TABLE Courses (course_id text, course_name text, course_description text, other_details text); CREATE TABLE People_Addresses (person_address_id number, person_id number, address_id number, date_from time, date_to time); CREATE TABLE Student_Course_Registrations (student_id number, course_id number, registration_date time); CREATE TABLE Student_Course_Attendance (student_id number, course_id number, date_of_attendance time); CREATE TABLE Candidates (candidate_id number, candidate_details text); CREATE TABLE Candidate_Assessments (candidate_id number, qualification text, assessment_date time, asessment_outcome_code text);

Find id of the candidate who most recently accessed the course?

SELECT candidate_id FROM candidate_assessments ORDER BY assessment_date DESC LIMIT 1

medium

CREATE TABLE Addresses (address_id number, line_1 text, line_2 text, city text, zip_postcode text, state_province_county text, country text); CREATE TABLE People (person_id number, first_name text, middle_name text, last_name text, cell_mobile_number text, email_address text, login_name text, password text); CREATE TABLE Students (student_id number, student_details text); CREATE TABLE Courses (course_id text, course_name text, course_description text, other_details text); CREATE TABLE People_Addresses (person_address_id number, person_id number, address_id number, date_from time, date_to time); CREATE TABLE Student_Course_Registrations (student_id number, course_id number, registration_date time); CREATE TABLE Student_Course_Attendance (student_id number, course_id number, date_of_attendance time); CREATE TABLE Candidates (candidate_id number, candidate_details text); CREATE TABLE Candidate_Assessments (candidate_id number, qualification text, assessment_date time, asessment_outcome_code text);

What is the id of the candidate who most recently accessed the course?

SELECT candidate_id FROM candidate_assessments ORDER BY assessment_date DESC LIMIT 1

medium

CREATE TABLE Addresses (address_id number, line_1 text, line_2 text, city text, zip_postcode text, state_province_county text, country text); CREATE TABLE People (person_id number, first_name text, middle_name text, last_name text, cell_mobile_number text, email_address text, login_name text, password text); CREATE TABLE Students (student_id number, student_details text); CREATE TABLE Courses (course_id text, course_name text, course_description text, other_details text); CREATE TABLE People_Addresses (person_address_id number, person_id number, address_id number, date_from time, date_to time); CREATE TABLE Student_Course_Registrations (student_id number, course_id number, registration_date time); CREATE TABLE Student_Course_Attendance (student_id number, course_id number, date_of_attendance time); CREATE TABLE Candidates (candidate_id number, candidate_details text); CREATE TABLE Candidate_Assessments (candidate_id number, qualification text, assessment_date time, asessment_outcome_code text);

What is detail of the student who registered the most number of courses?

SELECT T1.student_details FROM students AS T1 JOIN student_course_registrations AS T2 ON T1.student_id = T2.student_id GROUP BY T1.student_id ORDER BY count(*) DESC LIMIT 1

extra

CREATE TABLE Addresses (address_id number, line_1 text, line_2 text, city text, zip_postcode text, state_province_county text, country text); CREATE TABLE People (person_id number, first_name text, middle_name text, last_name text, cell_mobile_number text, email_address text, login_name text, password text); CREATE TABLE Students (student_id number, student_details text); CREATE TABLE Courses (course_id text, course_name text, course_description text, other_details text); CREATE TABLE People_Addresses (person_address_id number, person_id number, address_id number, date_from time, date_to time); CREATE TABLE Student_Course_Registrations (student_id number, course_id number, registration_date time); CREATE TABLE Student_Course_Attendance (student_id number, course_id number, date_of_attendance time); CREATE TABLE Candidates (candidate_id number, candidate_details text); CREATE TABLE Candidate_Assessments (candidate_id number, qualification text, assessment_date time, asessment_outcome_code text);

What are the details of the student who registered for the most number of courses?

SELECT T1.student_details FROM students AS T1 JOIN student_course_registrations AS T2 ON T1.student_id = T2.student_id GROUP BY T1.student_id ORDER BY count(*) DESC LIMIT 1

extra

CREATE TABLE Addresses (address_id number, line_1 text, line_2 text, city text, zip_postcode text, state_province_county text, country text); CREATE TABLE People (person_id number, first_name text, middle_name text, last_name text, cell_mobile_number text, email_address text, login_name text, password text); CREATE TABLE Students (student_id number, student_details text); CREATE TABLE Courses (course_id text, course_name text, course_description text, other_details text); CREATE TABLE People_Addresses (person_address_id number, person_id number, address_id number, date_from time, date_to time); CREATE TABLE Student_Course_Registrations (student_id number, course_id number, registration_date time); CREATE TABLE Student_Course_Attendance (student_id number, course_id number, date_of_attendance time); CREATE TABLE Candidates (candidate_id number, candidate_details text); CREATE TABLE Candidate_Assessments (candidate_id number, qualification text, assessment_date time, asessment_outcome_code text);

List the id of students who registered some courses and the number of their registered courses?

SELECT T1.student_id , count(*) FROM students AS T1 JOIN student_course_registrations AS T2 ON T1.student_id = T2.student_id GROUP BY T1.student_id

medium

CREATE TABLE Addresses (address_id number, line_1 text, line_2 text, city text, zip_postcode text, state_province_county text, country text); CREATE TABLE People (person_id number, first_name text, middle_name text, last_name text, cell_mobile_number text, email_address text, login_name text, password text); CREATE TABLE Students (student_id number, student_details text); CREATE TABLE Courses (course_id text, course_name text, course_description text, other_details text); CREATE TABLE People_Addresses (person_address_id number, person_id number, address_id number, date_from time, date_to time); CREATE TABLE Student_Course_Registrations (student_id number, course_id number, registration_date time); CREATE TABLE Student_Course_Attendance (student_id number, course_id number, date_of_attendance time); CREATE TABLE Candidates (candidate_id number, candidate_details text); CREATE TABLE Candidate_Assessments (candidate_id number, qualification text, assessment_date time, asessment_outcome_code text);

For every student who is registered for some course, how many courses are they registered for?

SELECT T1.student_id , count(*) FROM students AS T1 JOIN student_course_registrations AS T2 ON T1.student_id = T2.student_id GROUP BY T1.student_id

medium

CREATE TABLE Addresses (address_id number, line_1 text, line_2 text, city text, zip_postcode text, state_province_county text, country text); CREATE TABLE People (person_id number, first_name text, middle_name text, last_name text, cell_mobile_number text, email_address text, login_name text, password text); CREATE TABLE Students (student_id number, student_details text); CREATE TABLE Courses (course_id text, course_name text, course_description text, other_details text); CREATE TABLE People_Addresses (person_address_id number, person_id number, address_id number, date_from time, date_to time); CREATE TABLE Student_Course_Registrations (student_id number, course_id number, registration_date time); CREATE TABLE Student_Course_Attendance (student_id number, course_id number, date_of_attendance time); CREATE TABLE Candidates (candidate_id number, candidate_details text); CREATE TABLE Candidate_Assessments (candidate_id number, qualification text, assessment_date time, asessment_outcome_code text);

How many registed students do each course have? List course name and the number of their registered students?

SELECT T3.course_name , count(*) FROM students AS T1 JOIN student_course_registrations AS T2 ON T1.student_id = T2.student_id JOIN courses AS T3 ON T2.course_id = T3.course_id GROUP BY T2.course_id

hard

CREATE TABLE Addresses (address_id number, line_1 text, line_2 text, city text, zip_postcode text, state_province_county text, country text); CREATE TABLE People (person_id number, first_name text, middle_name text, last_name text, cell_mobile_number text, email_address text, login_name text, password text); CREATE TABLE Students (student_id number, student_details text); CREATE TABLE Courses (course_id text, course_name text, course_description text, other_details text); CREATE TABLE People_Addresses (person_address_id number, person_id number, address_id number, date_from time, date_to time); CREATE TABLE Student_Course_Registrations (student_id number, course_id number, registration_date time); CREATE TABLE Student_Course_Attendance (student_id number, course_id number, date_of_attendance time); CREATE TABLE Candidates (candidate_id number, candidate_details text); CREATE TABLE Candidate_Assessments (candidate_id number, qualification text, assessment_date time, asessment_outcome_code text);

For each course id, how many students are registered and what are the course names?

SELECT T3.course_name , count(*) FROM students AS T1 JOIN student_course_registrations AS T2 ON T1.student_id = T2.student_id JOIN courses AS T3 ON T2.course_id = T3.course_id GROUP BY T2.course_id

hard

CREATE TABLE Addresses (address_id number, line_1 text, line_2 text, city text, zip_postcode text, state_province_county text, country text); CREATE TABLE People (person_id number, first_name text, middle_name text, last_name text, cell_mobile_number text, email_address text, login_name text, password text); CREATE TABLE Students (student_id number, student_details text); CREATE TABLE Courses (course_id text, course_name text, course_description text, other_details text); CREATE TABLE People_Addresses (person_address_id number, person_id number, address_id number, date_from time, date_to time); CREATE TABLE Student_Course_Registrations (student_id number, course_id number, registration_date time); CREATE TABLE Student_Course_Attendance (student_id number, course_id number, date_of_attendance time); CREATE TABLE Candidates (candidate_id number, candidate_details text); CREATE TABLE Candidate_Assessments (candidate_id number, qualification text, assessment_date time, asessment_outcome_code text);

Find id of candidates whose assessment code is "Pass"?

SELECT candidate_id FROM candidate_assessments WHERE asessment_outcome_code = "Pass"

easy

CREATE TABLE Addresses (address_id number, line_1 text, line_2 text, city text, zip_postcode text, state_province_county text, country text); CREATE TABLE People (person_id number, first_name text, middle_name text, last_name text, cell_mobile_number text, email_address text, login_name text, password text); CREATE TABLE Students (student_id number, student_details text); CREATE TABLE Courses (course_id text, course_name text, course_description text, other_details text); CREATE TABLE People_Addresses (person_address_id number, person_id number, address_id number, date_from time, date_to time); CREATE TABLE Student_Course_Registrations (student_id number, course_id number, registration_date time); CREATE TABLE Student_Course_Attendance (student_id number, course_id number, date_of_attendance time); CREATE TABLE Candidates (candidate_id number, candidate_details text); CREATE TABLE Candidate_Assessments (candidate_id number, qualification text, assessment_date time, asessment_outcome_code text);

What are the ids of the candidates that have an outcome code of Pass?

SELECT candidate_id FROM candidate_assessments WHERE asessment_outcome_code = "Pass"

easy

CREATE TABLE Addresses (address_id number, line_1 text, line_2 text, city text, zip_postcode text, state_province_county text, country text); CREATE TABLE People (person_id number, first_name text, middle_name text, last_name text, cell_mobile_number text, email_address text, login_name text, password text); CREATE TABLE Students (student_id number, student_details text); CREATE TABLE Courses (course_id text, course_name text, course_description text, other_details text); CREATE TABLE People_Addresses (person_address_id number, person_id number, address_id number, date_from time, date_to time); CREATE TABLE Student_Course_Registrations (student_id number, course_id number, registration_date time); CREATE TABLE Student_Course_Attendance (student_id number, course_id number, date_of_attendance time); CREATE TABLE Candidates (candidate_id number, candidate_details text); CREATE TABLE Candidate_Assessments (candidate_id number, qualification text, assessment_date time, asessment_outcome_code text);

Find the cell mobile number of the candidates whose assessment code is "Fail"?

SELECT T3.cell_mobile_number FROM candidates AS T1 JOIN candidate_assessments AS T2 ON T1.candidate_id = T2.candidate_id JOIN people AS T3 ON T1.candidate_id = T3.person_id WHERE T2.asessment_outcome_code = "Fail"

hard

CREATE TABLE Addresses (address_id number, line_1 text, line_2 text, city text, zip_postcode text, state_province_county text, country text); CREATE TABLE People (person_id number, first_name text, middle_name text, last_name text, cell_mobile_number text, email_address text, login_name text, password text); CREATE TABLE Students (student_id number, student_details text); CREATE TABLE Courses (course_id text, course_name text, course_description text, other_details text); CREATE TABLE People_Addresses (person_address_id number, person_id number, address_id number, date_from time, date_to time); CREATE TABLE Student_Course_Registrations (student_id number, course_id number, registration_date time); CREATE TABLE Student_Course_Attendance (student_id number, course_id number, date_of_attendance time); CREATE TABLE Candidates (candidate_id number, candidate_details text); CREATE TABLE Candidate_Assessments (candidate_id number, qualification text, assessment_date time, asessment_outcome_code text);

What are the cell phone numbers of the candidates that received an assessment code of "Fail"?

SELECT T3.cell_mobile_number FROM candidates AS T1 JOIN candidate_assessments AS T2 ON T1.candidate_id = T2.candidate_id JOIN people AS T3 ON T1.candidate_id = T3.person_id WHERE T2.asessment_outcome_code = "Fail"

hard

CREATE TABLE Addresses (address_id number, line_1 text, line_2 text, city text, zip_postcode text, state_province_county text, country text); CREATE TABLE People (person_id number, first_name text, middle_name text, last_name text, cell_mobile_number text, email_address text, login_name text, password text); CREATE TABLE Students (student_id number, student_details text); CREATE TABLE Courses (course_id text, course_name text, course_description text, other_details text); CREATE TABLE People_Addresses (person_address_id number, person_id number, address_id number, date_from time, date_to time); CREATE TABLE Student_Course_Registrations (student_id number, course_id number, registration_date time); CREATE TABLE Student_Course_Attendance (student_id number, course_id number, date_of_attendance time); CREATE TABLE Candidates (candidate_id number, candidate_details text); CREATE TABLE Candidate_Assessments (candidate_id number, qualification text, assessment_date time, asessment_outcome_code text);

What are the id of students who registered course 301?

SELECT student_id FROM student_course_attendance WHERE course_id = 301

easy

CREATE TABLE Addresses (address_id number, line_1 text, line_2 text, city text, zip_postcode text, state_province_county text, country text); CREATE TABLE People (person_id number, first_name text, middle_name text, last_name text, cell_mobile_number text, email_address text, login_name text, password text); CREATE TABLE Students (student_id number, student_details text); CREATE TABLE Courses (course_id text, course_name text, course_description text, other_details text); CREATE TABLE People_Addresses (person_address_id number, person_id number, address_id number, date_from time, date_to time); CREATE TABLE Student_Course_Registrations (student_id number, course_id number, registration_date time); CREATE TABLE Student_Course_Attendance (student_id number, course_id number, date_of_attendance time); CREATE TABLE Candidates (candidate_id number, candidate_details text); CREATE TABLE Candidate_Assessments (candidate_id number, qualification text, assessment_date time, asessment_outcome_code text);

What are the ids of the students who registered for course 301?

SELECT student_id FROM student_course_attendance WHERE course_id = 301

easy

CREATE TABLE Addresses (address_id number, line_1 text, line_2 text, city text, zip_postcode text, state_province_county text, country text); CREATE TABLE People (person_id number, first_name text, middle_name text, last_name text, cell_mobile_number text, email_address text, login_name text, password text); CREATE TABLE Students (student_id number, student_details text); CREATE TABLE Courses (course_id text, course_name text, course_description text, other_details text); CREATE TABLE People_Addresses (person_address_id number, person_id number, address_id number, date_from time, date_to time); CREATE TABLE Student_Course_Registrations (student_id number, course_id number, registration_date time); CREATE TABLE Student_Course_Attendance (student_id number, course_id number, date_of_attendance time); CREATE TABLE Candidates (candidate_id number, candidate_details text); CREATE TABLE Candidate_Assessments (candidate_id number, qualification text, assessment_date time, asessment_outcome_code text);

What is the id of the student who most recently registered course 301?

SELECT student_id FROM student_course_attendance WHERE course_id = 301 ORDER BY date_of_attendance DESC LIMIT 1

hard

CREATE TABLE Addresses (address_id number, line_1 text, line_2 text, city text, zip_postcode text, state_province_county text, country text); CREATE TABLE People (person_id number, first_name text, middle_name text, last_name text, cell_mobile_number text, email_address text, login_name text, password text); CREATE TABLE Students (student_id number, student_details text); CREATE TABLE Courses (course_id text, course_name text, course_description text, other_details text); CREATE TABLE People_Addresses (person_address_id number, person_id number, address_id number, date_from time, date_to time); CREATE TABLE Student_Course_Registrations (student_id number, course_id number, registration_date time); CREATE TABLE Student_Course_Attendance (student_id number, course_id number, date_of_attendance time); CREATE TABLE Candidates (candidate_id number, candidate_details text); CREATE TABLE Candidate_Assessments (candidate_id number, qualification text, assessment_date time, asessment_outcome_code text);

What are the ids of the students who registered for course 301 most recently?

SELECT student_id FROM student_course_attendance WHERE course_id = 301 ORDER BY date_of_attendance DESC LIMIT 1

hard

CREATE TABLE Addresses (address_id number, line_1 text, line_2 text, city text, zip_postcode text, state_province_county text, country text); CREATE TABLE People (person_id number, first_name text, middle_name text, last_name text, cell_mobile_number text, email_address text, login_name text, password text); CREATE TABLE Students (student_id number, student_details text); CREATE TABLE Courses (course_id text, course_name text, course_description text, other_details text); CREATE TABLE People_Addresses (person_address_id number, person_id number, address_id number, date_from time, date_to time); CREATE TABLE Student_Course_Registrations (student_id number, course_id number, registration_date time); CREATE TABLE Student_Course_Attendance (student_id number, course_id number, date_of_attendance time); CREATE TABLE Candidates (candidate_id number, candidate_details text); CREATE TABLE Candidate_Assessments (candidate_id number, qualification text, assessment_date time, asessment_outcome_code text);

Find distinct cities of addresses of people?

SELECT DISTINCT T1.city FROM addresses AS T1 JOIN people_addresses AS T2 ON T1.address_id = T2.address_id

easy

CREATE TABLE Addresses (address_id number, line_1 text, line_2 text, city text, zip_postcode text, state_province_county text, country text); CREATE TABLE People (person_id number, first_name text, middle_name text, last_name text, cell_mobile_number text, email_address text, login_name text, password text); CREATE TABLE Students (student_id number, student_details text); CREATE TABLE Courses (course_id text, course_name text, course_description text, other_details text); CREATE TABLE People_Addresses (person_address_id number, person_id number, address_id number, date_from time, date_to time); CREATE TABLE Student_Course_Registrations (student_id number, course_id number, registration_date time); CREATE TABLE Student_Course_Attendance (student_id number, course_id number, date_of_attendance time); CREATE TABLE Candidates (candidate_id number, candidate_details text); CREATE TABLE Candidate_Assessments (candidate_id number, qualification text, assessment_date time, asessment_outcome_code text);

What are the different cities where people live?

SELECT DISTINCT T1.city FROM addresses AS T1 JOIN people_addresses AS T2 ON T1.address_id = T2.address_id

easy

CREATE TABLE Addresses (address_id number, line_1 text, line_2 text, city text, zip_postcode text, state_province_county text, country text); CREATE TABLE People (person_id number, first_name text, middle_name text, last_name text, cell_mobile_number text, email_address text, login_name text, password text); CREATE TABLE Students (student_id number, student_details text); CREATE TABLE Courses (course_id text, course_name text, course_description text, other_details text); CREATE TABLE People_Addresses (person_address_id number, person_id number, address_id number, date_from time, date_to time); CREATE TABLE Student_Course_Registrations (student_id number, course_id number, registration_date time); CREATE TABLE Student_Course_Attendance (student_id number, course_id number, date_of_attendance time); CREATE TABLE Candidates (candidate_id number, candidate_details text); CREATE TABLE Candidate_Assessments (candidate_id number, qualification text, assessment_date time, asessment_outcome_code text);

Find distinct cities of address of students?

SELECT DISTINCT T1.city FROM addresses AS T1 JOIN people_addresses AS T2 ON T1.address_id = T2.address_id JOIN students AS T3 ON T2.person_id = T3.student_id

medium

CREATE TABLE Addresses (address_id number, line_1 text, line_2 text, city text, zip_postcode text, state_province_county text, country text); CREATE TABLE People (person_id number, first_name text, middle_name text, last_name text, cell_mobile_number text, email_address text, login_name text, password text); CREATE TABLE Students (student_id number, student_details text); CREATE TABLE Courses (course_id text, course_name text, course_description text, other_details text); CREATE TABLE People_Addresses (person_address_id number, person_id number, address_id number, date_from time, date_to time); CREATE TABLE Student_Course_Registrations (student_id number, course_id number, registration_date time); CREATE TABLE Student_Course_Attendance (student_id number, course_id number, date_of_attendance time); CREATE TABLE Candidates (candidate_id number, candidate_details text); CREATE TABLE Candidate_Assessments (candidate_id number, qualification text, assessment_date time, asessment_outcome_code text);

What are the different cities where students live?

SELECT DISTINCT T1.city FROM addresses AS T1 JOIN people_addresses AS T2 ON T1.address_id = T2.address_id JOIN students AS T3 ON T2.person_id = T3.student_id

medium

CREATE TABLE Addresses (address_id number, line_1 text, line_2 text, city text, zip_postcode text, state_province_county text, country text); CREATE TABLE People (person_id number, first_name text, middle_name text, last_name text, cell_mobile_number text, email_address text, login_name text, password text); CREATE TABLE Students (student_id number, student_details text); CREATE TABLE Courses (course_id text, course_name text, course_description text, other_details text); CREATE TABLE People_Addresses (person_address_id number, person_id number, address_id number, date_from time, date_to time); CREATE TABLE Student_Course_Registrations (student_id number, course_id number, registration_date time); CREATE TABLE Student_Course_Attendance (student_id number, course_id number, date_of_attendance time); CREATE TABLE Candidates (candidate_id number, candidate_details text); CREATE TABLE Candidate_Assessments (candidate_id number, qualification text, assessment_date time, asessment_outcome_code text);

List the names of courses in alphabetical order?

SELECT course_name FROM courses ORDER BY course_name

easy

CREATE TABLE Addresses (address_id number, line_1 text, line_2 text, city text, zip_postcode text, state_province_county text, country text); CREATE TABLE People (person_id number, first_name text, middle_name text, last_name text, cell_mobile_number text, email_address text, login_name text, password text); CREATE TABLE Students (student_id number, student_details text); CREATE TABLE Courses (course_id text, course_name text, course_description text, other_details text); CREATE TABLE People_Addresses (person_address_id number, person_id number, address_id number, date_from time, date_to time); CREATE TABLE Student_Course_Registrations (student_id number, course_id number, registration_date time); CREATE TABLE Student_Course_Attendance (student_id number, course_id number, date_of_attendance time); CREATE TABLE Candidates (candidate_id number, candidate_details text); CREATE TABLE Candidate_Assessments (candidate_id number, qualification text, assessment_date time, asessment_outcome_code text);

What are the names of the courses in alphabetical order?

SELECT course_name FROM courses ORDER BY course_name

easy

CREATE TABLE Addresses (address_id number, line_1 text, line_2 text, city text, zip_postcode text, state_province_county text, country text); CREATE TABLE People (person_id number, first_name text, middle_name text, last_name text, cell_mobile_number text, email_address text, login_name text, password text); CREATE TABLE Students (student_id number, student_details text); CREATE TABLE Courses (course_id text, course_name text, course_description text, other_details text); CREATE TABLE People_Addresses (person_address_id number, person_id number, address_id number, date_from time, date_to time); CREATE TABLE Student_Course_Registrations (student_id number, course_id number, registration_date time); CREATE TABLE Student_Course_Attendance (student_id number, course_id number, date_of_attendance time); CREATE TABLE Candidates (candidate_id number, candidate_details text); CREATE TABLE Candidate_Assessments (candidate_id number, qualification text, assessment_date time, asessment_outcome_code text);

List the first names of people in alphabetical order?

SELECT first_name FROM people ORDER BY first_name

easy

CREATE TABLE Addresses (address_id number, line_1 text, line_2 text, city text, zip_postcode text, state_province_county text, country text); CREATE TABLE People (person_id number, first_name text, middle_name text, last_name text, cell_mobile_number text, email_address text, login_name text, password text); CREATE TABLE Students (student_id number, student_details text); CREATE TABLE Courses (course_id text, course_name text, course_description text, other_details text); CREATE TABLE People_Addresses (person_address_id number, person_id number, address_id number, date_from time, date_to time); CREATE TABLE Student_Course_Registrations (student_id number, course_id number, registration_date time); CREATE TABLE Student_Course_Attendance (student_id number, course_id number, date_of_attendance time); CREATE TABLE Candidates (candidate_id number, candidate_details text); CREATE TABLE Candidate_Assessments (candidate_id number, qualification text, assessment_date time, asessment_outcome_code text);

What are the first names of the people in alphabetical order?

SELECT first_name FROM people ORDER BY first_name

easy

CREATE TABLE Addresses (address_id number, line_1 text, line_2 text, city text, zip_postcode text, state_province_county text, country text); CREATE TABLE People (person_id number, first_name text, middle_name text, last_name text, cell_mobile_number text, email_address text, login_name text, password text); CREATE TABLE Students (student_id number, student_details text); CREATE TABLE Courses (course_id text, course_name text, course_description text, other_details text); CREATE TABLE People_Addresses (person_address_id number, person_id number, address_id number, date_from time, date_to time); CREATE TABLE Student_Course_Registrations (student_id number, course_id number, registration_date time); CREATE TABLE Student_Course_Attendance (student_id number, course_id number, date_of_attendance time); CREATE TABLE Candidates (candidate_id number, candidate_details text); CREATE TABLE Candidate_Assessments (candidate_id number, qualification text, assessment_date time, asessment_outcome_code text);

What are the id of students who registered courses or attended courses?

SELECT student_id FROM student_course_registrations UNION SELECT student_id FROM student_course_attendance

hard