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db<>fiddle
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id courseid cmid userid vote
9 4 9 3 1
23 4 9 2 1
8 4 10 3 2
22 4 10 2 3
7 4 11 2 3
21 4 19 2 2
courseid cmid vote count(A.vote)
4 9 1 2
4 10 2 1
4 10 3 1
4 11 3 1
4 19 2 1