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 as avg_question_cnt
from
( select university,
AVG(question_cnt) AS avg_question,
ROW_NUMBER() OVER (ORDER BY AVG(question_cnt)) AS ranking
from user_profile
group by university) as t
order by avg_question_cnt