题解 | #异常的邮件概率#
异常的邮件概率
https://www.nowcoder.com/practice/d6dd656483b545159d3aa89b4c26004e
SELECT DATE
,ROUND(SUM(IF(TYPE = 'no_completed',1,0))/COUNT(id),3) AS p
FROM email
WHERE send_id IN
(SELECT id
FROM user
WHERE is_blacklist = 0)
AND receive_id IN (
SELECT id
FROM user
WHERE is_blacklist = 0
)
GROUP BY DATE
order by date
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