SQL中如何判斷給定日期值

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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:

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:

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:

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:

SELECT * from  My_Range_GetWeekFirstAndEndDays('2011-09-01','2011-10-06')

上述就是小編為大家分享的SQL中如何判斷給定日期值了，如果剛好有類似的疑惑，不妨參照上述分析進(jìn)行理解。如果想知道更多相關(guān)知識(shí)，歡迎關(guān)注億速云行業(yè)資訊頻道。