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