USE test; SELECT class_id, gender , AVG(score) socre FROM students GROUP BY class_id, gender;
# class_id gender socre
1 M 89.0000
1 F 84.0000
2 F 81.0000
2 M 70.0000
3 F 88.0000
3 M 89.0000
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闲来舞剑
# class_id gender socre
1 M 89.0000
1 F 84.0000
2 F 81.0000
2 M 70.0000
3 F 88.0000
3 M 89.0000