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 university,
count(C.question_id)/count(distinct C.device_id) as avg_answer_cnt
from (
select
A.university,
B.question_id,
A.device_id
from
user_profile AS A inner join question_practice_detail AS B
on A.device_id = B.device_id) as C
group by C.university
order by C.university;
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