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) from user_profile up inner join question_practice_detail qpd on up.device_id = qpd.device_id group by up.university order by up.university