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) as avg_answer_cnt from user_profile as up right join question_practice_detail as qp on up.device_id=qp.device_id group by university;
