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 a.university,c.difficult_level,COUNT(FORMAT(b.question_id,4))/COUNT(DISTINCT(b.device_id)) AS avg_answer_cnt FROM question_practice_detail AS b LEFT JOIN user_profile AS a ON a.device_id=b.device_id LEFT JOIN question_detail AS c ON b.question_id=c.question_id GROUP BY a.university,c.difficult_level;
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