题解 | 异常的邮件概率
异常的邮件概率
https://www.nowcoder.com/practice/d6dd656483b545159d3aa89b4c26004e
-- 首先找到正常用户，然后根据日期分组，最后用sum(IF)去求失败概率
WITH white_user AS(
SELECT DISTINCT id
FROM user
WHERE is_blacklist = '0'
)
SELECT
date,
ROUND(SUM(IF(type = 'no_completed',1,0))/COUNT(*),3) p
FROM email
WHERE send_id IN(
SELECT id
FROM white_user
)
AND receive_id IN(
SELECT id
FROM white_user
)
GROUP BY date
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