题解 | #异常的邮件概率#
异常的邮件概率
https://www.nowcoder.com/practice/d6dd656483b545159d3aa89b4c26004e
计算右键异常的概率
不用联结，直接where过滤也可以
select date, format(sum(type='no_completed')/(count(type)),3) from email where send_id not in (select id from user where is_blacklist=1) and receive_id not in (select id from user where is_blacklist=1) group by date order by date;
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