题解 | #统计每个学校各难度的用户平均刷题数#
统计每个学校各难度的用户平均刷题数
https://www.nowcoder.com/practice/5400df085a034f88b2e17941ab338ee8
select
university,
difficult_level,
COUNT(qpd.question_id) / COUNT(distinct qpd.device_id) AS avg_answer_cnt
FROM
question_practice_detail as qpd
left join user_profile as up
on qpd.device_id = up.device_id
left join question_detail as qd
on qpd.question_id = qd.question_id
GROUP BY
university,difficult_level;
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