sql 查詢本周周一與周日時間

### 查詢系統當前時間
SELECT  GETDATE();

### 查詢本周周一時間
SELECT DATEADD(WEEK, DATEDIFF(WEEK, 0, CONVERT(DATETIME, GETDATE(), 120) - 1), 0);

### 查詢本周周日時間
SELECT DATEADD(DAY, 6, DATEADD(WEEK, DATEDIFF(WEEK, 0, CONVERT(DATETIME, GETDATE(), 120) - 1), 0));

### 查詢本周周一時間 
select dateadd(week,0,DATEADD(week,DATEDIFF(week,0,getdate()),0));

### 查詢本周周日時間
select dateadd(week,0,DATEADD(week,DATEDIFF(week,0,getdate()),6));

### 查詢上周周一時間
select dateadd(week,-1,DATEADD(week,DATEDIFF(week,0,getdate()),0)); 

### 查詢上周周日時間 
select dateadd(week,-1,DATEADD(week,DATEDIFF(week,0,getdate()),6));