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
http://www.nowcoder.com/practice/d1f5a1e50d0b49f3a39eb01c4fdb621f
SELECT answer_date,round(count(issue_id)/count(distinct author_id),2)as per_num
from answer_tb
where DATE_FORMAT(answer_date,"%Y-%m")="2021-11"
GROUP by answer_date
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