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 b.university as university ,c.difficult_level as difficult_level ,count(1) / count(distinct a.device_id) as difficult_level from question_practice_detail a left join user_profile b on a.device_id = b.device_id left join question_detail c on a.question_id = c.question_id group by 1,2
投递科锐国际等公司10个岗位