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) AS avg_answer_cnt FROM user_profile AS UP INNER JOIN question_practice_detail AS QPD ON QPD.device_id=UP.device_id GROUP BY university ORDER BY UP.university;
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