SQL中怎么判斷給定日期值

今天就跟大家聊聊有關(guān)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(jié)了以下內(nèi)容，希望大家根據(jù)這篇文章可以有所收獲。

一、給定一個(gè)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(gè)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(fù)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(cè)試:復(fù)制代碼 代碼如下: SELECT * from My_OneDay_GetWeekFirstAndEndDay('2010-09-01')

二、以上面單個(gè)日期搜索為基礎(chǔ)，由用戶輸入兩個(gè)參數(shù)，一個(gè)是開始日期，一個(gè)結(jié)束日期，根據(jù)這兩個(gè)參數(shù)，求出在此時(shí)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(jié)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(fù)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(cè)試:復(fù)制代碼 代碼如下: SELECT * from My_Range_GetWeekFirstAndEndDays('2011-09-01','2011-10-06')

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