牛客815698333号

分类

题解(26)

/ 注册

全部文章（共1篇）

题解 | #计算用户的平均次日留存率#

with u1 as (select distinct device_id,date from question_practice_detail) select (count(u2.device_id))/(count(u1.device_id)) from u1 left join u1 as ...

Mysql

2021-12-16

0 210