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) per_num
from answer_tb
group by
answer_date
order by answer_date