题解 | #分组排序练习题#
分组排序练习题
https://www.nowcoder.com/practice/e00bbac732cb4b6bbc62a52b930cb15e
select university, avg(question_cnt) as 'avg_question_cnt' from user_profile group by university order by avg_question_cnt
1、分组查询, 按照学校
2、先group by, 后order by