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
t1.university,
t3.difficult_level,
(count(t2.question_id) / count(distinct t1.device_id)) avg_answer_cnt
from user_profile t1
left join question_practice_detail t2
on t1.device_id = t2.device_id
left join question_detail t3
on t2.question_id = t3.question_id
where t1.university = '山东大学'
group by t3.difficult_level
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