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
u.university,round(count(q.question_id)/count(distinct q.device_id),4) as avg_answer_cnt
from user_profile u
join question_practice_detail q
on u.device_id=q.device_id
group by university
order by university
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