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(c.question_id)/count(distinct device_id),4) as avg_answer_cnt from (select university, a.device_id, question_id from user_profile a join question_practice_detail b on a.device_id=b.device_id) c join question_detail d on c.question_id=d.question_id group by university, difficult_level
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