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, round(count(qd.question_id)/count(distinct qpd.device_id),4)avg_answer_cnt from user_profile up join question_practice_detail qpd using(device_id) join question_detail qd using(question_id) group by up.university,qd.difficult_level
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