题解 | #统计每个学校的答过题的用户的平均答题数#
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, count(question_id)/count(distinct q.device_id)as avg_answer_cnt from user_profile as u inner join question_practice_detail as q on u.device_id=q.device_id group by university
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