题解 | #某乎问答11月份日人均回答量#
某乎问答11月份日人均回答量
https://www.nowcoder.com/practice/d1f5a1e50d0b49f3a39eb01c4fdb621f
select answer_date ,round(count(issue_id)/count(distinct author_id),2) as 'per_num' from answer_tb where left(answer_date,7) = '2021-11' group by answer_date order by answer_date