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(*) / COUNT(DISTINCT author_id),2) AS per_num
FROM answer_tb
WHERE answer_date >= '2021-11-1'
AND answer_date < '2021-12-1'
GROUP BY answer_date
ORDER BY answer_date;