SQL 動態 where語句（case when）

select * from tablename

where time>= case when DATEDIFF(DAY,DATEADD(week,DATEDIFF(week,0,getdate()),0),GETDATE())=0

                       then DATEADD(week,-1,DATEADD(week,DATEDIFF(week,0,GETDATE()),0))

　　　　　　else DATEADD(week,DATEDIFF(week,0,getdate()),0)

　　　　　　end

 

邏輯 ：如果當前是周一，就查詢上周一以來的數據，否則就查詢本周數據；

//上周一

select  DATEADD(week,-1,DATEADD(week,DATEDIFF(week,0,GETDATE()),0)) 

//本周一

select  DATEADD(week,DATEDIFF(week,0,getdate()),0)