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(avg(type='no_completed'),3)
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`;
