作业一,计算每个班的平均成绩并排序
SELECT class_id,ceiling(AVG(score)) avg_score from students GROUP BY class_id ORDER BY avg_score desc;
作业二,
select class_id,gender,AVG(score) from students GROUP BY gender,class_id;
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一个头很大的胖子
作业一,计算每个班的平均成绩并排序
作业二,