题解 | #计算用户的平均次日留存率#
计算用户的平均次日留存率
https://www.nowcoder.com/practice/126083961ae0415fbde061d7ebbde453
with tmp
as(
select
device_id
,date
from question_practice_detail
group by 1,2
)
select
count(b.device_id) / count(a.device_id)
from tmp a
left join tmp b
on a.device_id = b.device_id
and a.date = date_sub(b.date,interval 1 day)
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