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
select count( a.device_id)/count( b.device_id)
from
(select distinct device_id,date
from
(select
distinct device_id,
date as date,
lead(date) over (partition by device_id order by date) as date2
from question_practice_detail)k
where date=date2-1 )a
right join
(select distinct device_id,date from question_practice_detail) b
using(device_id,date)
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