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, d.difficult_level, count(q.question_id)/count(distinct q.device_id) as avg_answer_cnt from user_profile u join question_practice_detail q on u.device_id = q.device_id join question_detail d on q.question_id = d.question_id group by u.university, d.difficult_level
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