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 question_practice_detail AS qpd INNER JOIN user_profile AS up ON qpd.device_id = up.device_id GROUP BY university;
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