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
http://www.nowcoder.com/practice/88aa923a9a674253b861a8fa56bac8e5
select
university,
count(question_practice_detail.question_id) / count(distinct question_practice_detail.device_id) as avg_answer_cnt
from question_practice_detail
inner join user_profile
on user_profile.device_id = question_practice_detail.device_id
group by university
华为工作强度 811人发布