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)
FROM user_profile up
JOIN question_practice_detail qpd USING (device_id)
JOIN question_detail USING (question_id)
GROUP BY difficult_level,university
ORDER BY university
查看17道真题和解析
