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 up.university,
round(count(qpd.question_id)/count(distinct qpd.device_id), 4) as avg_answer_cnt
from question_practice_detail qpd
join user_profile up
using(device_id)
group by up.university
order by up.university;
终于对了！
