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, count(qpd.question_id)/count(distinct qpd.device_id) as avg_answer_cnt from question_practice_detail as qpd left join user_profile as up on qpd.device_id=up.device_id left join question_detail as qd on qd.question_id=qpd.question_id group by university,difficult_level
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