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
up.university,
qp.difficult_level,
round(count(qpd.question_id)/count(distinct qpd.device_id),4 ) as avg_answer_cnt
from question_practice_detail as qpd
left join user_profile as up on up.device_id=qpd.device_id
left join question_detail as qp on qp.question_id=qpd.question_id
where up.university='山东大学'
group by university,difficult_level
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