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(qp.question_id) / count(distinct qp.device_id) avg_answer_cnt
FROM
question_practice_detail qp
left join user_profile u on qp.device_id = u.device_id
left join question_detail qd on qp.question_id = qd.question_id
group by
university,
difficult_level
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