鸭梨杉达

分类

/ 注册

全部文章（共1篇）

题解 | #计算用户的平均次日留存率#

select round(count(distinct t1.device_id,t1.date)/count(distinct t.device_id,t.date),4) as avg_ret from question_practice_detail t left join question...

自联结、datediff、count

2022-07-15

21 429