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join operations done #19

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join operations done #19

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1 change: 1 addition & 0 deletions answers/exercise1.sql
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SELECT * FROM Enrolment LEFT JOIN Students ON Enrolment.StudentID=Students.StudentID;
1 change: 1 addition & 0 deletions answers/exercise2.sql
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SELECT * FROM Students INNER JOIN Enrolment ON Enrolment.StudentID=Students.StudentID;
5 changes: 5 additions & 0 deletions answers/exercise3.sql
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SELECT * FROM Students INNER JOIN
Enrolment ON Enrolment.StudentID=Students.StudentID
UNION
SELECT * FROM Enrolment INNER JOIN
Students ON Enrolment.StudentID=Students.StudentID;
1 change: 1 addition & 0 deletions answers/exercise4.sql
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SELECT Country,count(*) FROM Students GROUP BY Country;
1 change: 1 addition & 0 deletions answers/exercise5.sql
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SELECT count(StudentID) FROM Students GROUP BY Country ORDER BY count(*) DESC;
2 changes: 2 additions & 0 deletions answers/exercise6.sql
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SELECT COUNT(*) FROM Students GROUP BY Country ORDER BY COUNT(*) >10 ASC;