SQL中怎么判斷給定日期值

今天就跟大家聊聊有關SQL中怎么判斷給定日期值，可能很多人都不太了解，為了讓大家更加了解，小編給大家總結了以下內容，希望大家根據這篇文章可以有所收獲。

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據 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，一個是開始日期，一個結束日期，根據這兩個參數，求出在此時期段內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

Function測試:復制代碼 代碼如下: SELECT * from My_Range_GetWeekFirstAndEndDays('2011-09-01','2011-10-06')

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