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
问题分解:
- 限定条件:无;
- 不同大学:按学校分组
group by university - 平均发帖数:
avg(question_cnt) - 升序排序:
order by avg_question_cnt
细节问题:
- 表头重命名:as
