chung305 / sql.letsgettogether

SQL: Let's Get Together

Given the scenarios, add the the directed queries to the "answers" directory's files.

Introduction to Joins

Insert the missing parts in the JOIN clause to join the two tables Enrolments and Students, using the StudentID field in both tables as the relationship between the two tables.

SELECT *
FROM Enrolments
LEFT JOIN Students
[insert clause here];

(Add your query to the file exercise1.sql)

Choose the correct JOIN clause to select all records from the two tables where there is a match in both tables.

SELECT *
FROM Enrolments
[insert clause here]
ON Enrolments.StudentID=Students.StudentID;

(Add your query to the file exercise2.sql)

Choose the correct JOIN clause to select all the records from the Students table plus all the matches in the Enrolments table.

SELECT *
FROM Enrolments
[insert clause here]
ON Enrolments.StudentID=Students.StudentID;

(Add your query to the file exercise3.sql)

Grouping records by Column

List the number of Students in each Country.

(Add your query to the file exercise4.sql)

List the number of Students in each Country, ordered by the Country with the most Students first.

(Add your query to the file exercise5.sql)

List the number of Students in each Country, ordered by the Country with the most Students first, where the number of students is greater than 10.

(Add your query to the file exercise6.sql)