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 university,difficult_level,round(count(qpd.question_id)/count(distinct qpd.device_id),4) avg_answer_cn from user_profile up join question_practice_detail qpd on up.device_id=qpd.device_id join question_detail qd on qpd.question_id=qd.question_id group by university,difficult_level;
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