题解 | #统计每个用户的平均刷题数#
统计每个用户的平均刷题数
https://www.nowcoder.com/practice/f4714f7529404679b7f8909c96299ac4
select university,difficult_level, count(qpd.question_id)/count(distinct qpd.device_id) avg_answer_cnt from user_profile up inner join question_practice_detail qpd on up.device_id=qpd.device_id inner join question_detail qd on qpd.question_id=qd.question_id where university="山东大学" group by difficult_level
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