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