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 b.university,
COUNT(a.question_id)/count(distinct a.device_id) as avg_answer_cnt
from question_practice_detail as a JOIN user_profile as b
on a.device_id = b.device_id
GROUP BY b.university;
美团一面2245人在聊
