题解 | #异常的邮件概率#
异常的邮件概率
https://www.nowcoder.com/practice/d6dd656483b545159d3aa89b4c26004e
select date,format(count(if(type = 'no_completed',1,null)) / count(type),3) from email e,user u where e.send_id not in (select id from user where is_blacklist=1) AND e.receive_id not in(select id from user where is_blacklist=1) group by date order by date
#MySQL#
