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 ,round(count(question_id)/count(distinct up.device_id), 4) avg_answer_cnt from user_profile up inner join question_practice_detail qpd on up.device_id = qpd.device_id group by university