背景：有時侯導報表需要動態計算每個月對應每週的第一天與最後一天。最後一週的時間要求不需要僅精確到第7天，可以算10天。

USE [***]
GO

/****** Object:  StoredProcedure [dbo].[sp_CalcStartDateEndDateForSingleYearMonthInDate]    Script Date: 2016/2/25 14:28:26 ******/
DROP PROCEDURE [dbo].[sp_CalcStartDateEndDateForSingleYearMonthInDate]
GO

/****** Object:  StoredProcedure [dbo].[sp_CalcStartDateEndDateForSingleYearMonthInDate]    Script Date: 2016/2/25 14:28:26 ******/
SET ANSI_NULLS ON
GO

SET QUOTED_IDENTIFIER ON
GO







/*
	
	exec [sp_CalcStartDateEndDateForSingleYearMonthInDate] '2016-1-1'
	exec [sp_CalcStartDateEndDateForSingleYearMonthInDate] '2015-10-1'
	exec [sp_CalcStartDateEndDateForSingleYearMonthInDate] '2015-9-1'
	exec [sp_CalcStartDateEndDateForSingleYearMonthInDate] '2014-3-1'

*/

CREATE PROC [dbo].[sp_CalcStartDateEndDateForSingleYearMonthInDate](
	@SingleDate datetime
)
AS
BEGIN
   
	    
	DECLARE @month VARCHAR(2)
	DECLARE @year VARCHAR(4)

	DECLARE @FirstDayInFeb DATETIME
	DECLARE @LastDayInFeb DATETIME

	if(@SingleDate is null)
		set @SingleDate=getdate()

	SET @month= MONTH(@SingleDate)
	SET @year=YEAR(@SingleDate)

	SET @FirstDayInFeb = CONVERT(DATETIME, @year+'-02-01')
	SET @LastDayInFeb = DATEADD(M, 1, @FirstDayInFeb)
	SET @LastDayInFeb = DATEADD(D, -1, @LastDayInFeb)


	--drop table @tWeek

	--CREATE TABLE @tWeek
	--(
	--startDate VARCHAR(10),
	--endDate VARCHAR(10),
	--weekIndex INT
	--)

	declare  @tWeek TABLE
	 (
		startDate VARCHAR(10),
		endDate VARCHAR(10),
		weekIndex INT
	)

	INSERT INTO @tWeek VALUES  ( @year+'-'
 
[email protected]+'-1',@year+'-'[email protected]+'-7', 1)
	INSERT INTO @tWeek VALUES  ( @year+'-'[email protected]+'-8',@year+'-'[email protected]+'-14', 2)
	INSERT INTO @tWeek VALUES  ( @year+'-'[email protected]+'-15',@year+'-'[email protected]+'-21', 3)

	IF @month IN (1,3,5,7,8,10,12)

		INSERT INTO @tWeek VALUES  ( @year+'-'
 
[email protected]+'-22',@year+'-'[email protected]+'-31', 4)

	IF @month IN (4,6,9,11)

		INSERT INTO @tWeek VALUES  ( @year+'-'[email protected]+'-22',@year+'-'[email protected]+'-30', 4)

	IF @month=2

		INSERT INTO @tWeek VALUES  (  @year+'-'[email protected]+'-22',  CONVERT(VARCHAR(10),@LastDayInFeb,120),4)


	SELECT * FROM @tWeek


  
END
 







GO


 

執行結果：