最近報表要用到一項功能,需要把數據源根據記錄發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:
- 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:
- 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並排序。
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:
- 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:
- SELECT * from My_Range_GetWeekFirstAndEndDays('2011-09-01','2011-10-06')