题解 | #统计每个学校各难度的用户平均刷题数#
统计每个学校各难度的用户平均刷题数
https://www.nowcoder.com/practice/5400df085a034f88b2e17941ab338ee8
select
u.university,difficult_level,count(answer_cnt)/count(distinct q.device_id) as avg_answer_cnt
from
user_profile u,
question_practice_detail q,
question_detail qd
where
u.device_id=q.device_id and q.question_id =qd.question_id
group by
university,qd.difficult_level
order by
university;
查看22道真题和解析
让公司知道便宜没好货
