SQL 判斷給定日期值(或時間段)所在星期的星期一和星期天的日期

更新時間：2011年10月06日 23:43:51 作者：

最近報表要用到一項功能，需要把數(shù)據(jù)源根據(jù)記錄發(fā)生日期所在的星期序列進行分組。因此就寫了兩個相關SQL Function進行調用。

一、給定一個日期值，求出此日期所在星期的星期一和星期天的日期數(shù)據(jù)
例如給定一個日期 2010-09-01，求出它所在星期的星期一是2010-08-30，星期天是2010-09-05

Function創(chuàng)建如下:

復制代碼代碼如下:

 
USE [MSSQL] 
GO 
SET ANSI_NULLS ON 
GO 
SET QUOTED_IDENTIFIER ON 
GO 
CREATE FUNCTION [dbo].[My_OneDay_GetWeekFirstAndEndDay](@tmpDate DATETIME) 
RETURNS @tmpTable TABLE(FirstDay DATETIME , EndDay DATETIME) 
AS 
BEGIN 
INSERT INTO @tmpTable 
SELECT a.FirstDay,b.EndDay FROM ( 
SELECT 1 AS ID,DATEADD(wk, DATEDIFF(wk,0,@tmpDate), 0) AS FirstDAy 
) a 
LEFT JOIN ( 
SELECT 1 AS ID,DATEADD(wk, DATEDIFF(wk,0,@tmpDate), 6) AS EndDay 
) b 
ON a.ID = b.ID 
RETURN 
End 

Function測試:

復制代碼代碼如下:

SELECT * from My_OneDay_GetWeekFirstAndEndDay('2010-09-01')

二、以上面單個日期搜索為基礎，由用戶輸入兩個參數(shù)，一個是開始日期，一個結束日期，根據(jù)這兩個參數(shù)，求出在此時期段內(nèi)的所有星期的星期一和星期天的日期表并排序。
例如開始日期是2011-09-01,結束日期是2011-10-06，我們就可以得到此星期表如下:
WeekOrder FirstDay EndDay
1 2011-08-29 00:00:00.000 2011-09-04 00:00:00.000
2 2011-09-05 00:00:00.000 2011-09-11 00:00:00.000
3 2011-09-12 00:00:00.000 2011-09-18 00:00:00.000
4 2011-09-19 00:00:00.000 2011-09-25 00:00:00.000
5 2011-09-26 00:00:00.000 2011-10-02 00:00:00.000
6 2011-10-03 00:00:00.000 2011-10-09 00:00:00.000

Function創(chuàng)建如下:

復制代碼代碼如下:

 
USE [MSSQL] 
GO 
SET ANSI_NULLS ON 
GO 
SET QUOTED_IDENTIFIER ON 
GO 
CREATE FUNCTION [dbo].[MY_Range_GetWeekFirstAndEndDays](@tmpDateSTART DATETIME,@tmpDateEND DATETIME) 
RETURNS @tmpTable TABLE(WeekOrder INT,FirstDay DATETIME , EndDay DATETIME) 
AS 
BEGIN 
DECLARE @tmpDate DATETIME 
DECLARE @index INT 
SET @tmpDate=@tmpDateSTART 
SET @index=1 
WHILE @tmpDate <=@tmpDateEND 
BEGIN 
INSERT INTO @tmpTable 
SELECT @index,a.FirstDay,b.EndDay FROM ( 
SELECT 1 AS ID,DATEADD(wk, DATEDIFF(wk,0,@tmpDate), 0) AS FirstDAy) a 
LEFT JOIN ( 
SELECT 1 AS ID,DATEADD(wk, DATEDIFF(wk,0,@tmpDate), 6) AS EndDay) b 
ON a.ID = b.ID 

SET @tmpDate=DATEADD(DAY,7,@tmpDate) 
SET @index=@index+1 
END 
RETURN 
End 