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以下は私の質問です。Not A group by expression エラーの原因がわかりません。どんな助けでも大歓迎です。=)
SELECT c.courseID, c.courseName, AVG(a.Mark) as Average_Mark
FROM course c, assessment a
WHERE c.courseID = a.courseID
Group by c.courseID, c.courseName
ORDER BY Mark DESC;