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,qd.difficult_level,count(qpd.question_id)/count(distinct qpd.device_id) as avg_answer_cnt
from user_profile as u
inner join question_practice_detail as qpd
on u.device_id=qpd.device_id
inner join question_detail as qd
on qpd.question_id=qd.question_id
group by university,difficult_level;
正浩创新EcoFlow公司福利 510人发布
怪不得普通人连面试的机会都没有 笑了