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 question_practice_detail.device_id) AS avg_answer_cnt
FROM question_practice_detail AS question_practice_detail
INNER JOIN user_profile ON question_practice_detail.device_id = user_profile.device_id
GROUP BY university
投递长鑫存储等公司10个岗位