题解 | 统计每个学校的答过题的用户的平均答题数
统计每个学校的答过题的用户的平均答题数
https://www.nowcoder.com/practice/88aa923a9a674253b861a8fa56bac8e5
select
up.university,
round(count(qpd.question_id)/count(distinct(qpd.device_id)),4) as avg_answer_cnt
from question_practice_detail qpd
left join user_profile up
on qpd.device_id=up.device_id
group by up.university
order by up.university asc;
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