SQL22 题解 | #统计平均答题数#
统计每个学校的答过题的用户的平均答题数
https://www.nowcoder.com/practice/88aa923a9a674253b861a8fa56bac8e5
select university,round(count(question_id)/count(distinct question_practice_detail.device_id),4) as avg_answer_cnt from user_profile,question_practice_detail where user_profile.device_id = question_practice_detail.device_id group by university
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