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done #6

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3 changes: 3 additions & 0 deletions answers/exercise1.sql
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Original file line number Diff line number Diff line change
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SELECT * FROM Enrolments
LEFT JOIN Students
ON Enrolments.StudentID = Students.StudentID;
3 changes: 3 additions & 0 deletions answers/exercise2.sql
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SELECT * FROM Enrolments
INNER JOIN Students
ON Enrolments.StudentID = Students.StudentID;
3 changes: 3 additions & 0 deletions answers/exercise3.sql
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SELECT * FROM Enrolments
LEFT OUTER JOIN Students
ON Enrolments.StudentID = Students.StudentID;
2 changes: 2 additions & 0 deletions answers/exercise4.sql
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SELECT country, COUNT(*) FROM Students
GROUP BY country;
3 changes: 3 additions & 0 deletions answers/exercise5.sql
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SELECT country, COUNT(*) FROM Students
GROUP BY country
ORDER BY COUNT(*) DESC;
4 changes: 4 additions & 0 deletions answers/exercise6.sql
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SELECT country, COUNT(*) FROM Students
WHERE COUNT(*) > 10
GROUP BY country
ORDER BY COUNT(*) DESC;