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,
count(u.university)/count(DISTINCT u.device_id)as answer
from user_profile as u inner join question_practice_detail as q
on u.device_id=q.device_id
group by u.university;
count(u.university)/count(DISTINCT u.device_id)as answer
from user_profile as u inner join question_practice_detail as q
on u.device_id=q.device_id
group by u.university;
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