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 UP.university,QD.difficult_level,count(QPD.question_id)/count(DISTINCT QPD.device_id) AS avg_answer_cnt FROM question_practice_detail AS QPD LEFT JOIN question_detail AS QD ON QPD.question_id=QD.question_id LEFT JOIN user_profile AS UP ON UP.device_id=QPD.device_id GROUP BY QD.difficult_level,UP.university;
，敢不敢来
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