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(qp.question_id)/count(distinct(qp.device_id)) avg_answer_cnt from question_practice_detail qp,user_profile up where qp.device_id=up.device_id group by up.university order by up.university asc
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