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 u.device_id),
4
) as avg_answer_cnt
from
user_profile as u
inner join question_practice_detail as q on u.device_id = q.device_id
group by
u.university
order by
u.university;
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