導讀:1建站知識程序開發過程中需要做周別統計與顯示報表。在做之前，得先找出所在年份周別的開始日期與結束日期。每年每周的如何seo優化推廣網站個業網站建設公司。

文件：.wmv；大小：19,535KB；長度：00:26:39。 下載地址：SqlFunction_udf_Week.rar以下內容于20120105更新： 2012年剛到，開發的軟件使用這個函數發現bug。2012年第一周應該是2012-01-01至2012-01-07，但此函數卻把2012-01-08至2012-01-14當作第一周。 就此bug對此函數修改如下：

復制代碼 代碼如下:

SET ANSI_NULLS ON GO SET QUOTED_IDENTIFIER ON GO ALTER FUNCTION [dbo].[udf_Week] ( @StartYear INT, @EndYear INT ) RETURNS @Week TABLE([WeekId] INT IDENTITY(1,1) PRIMARY KEY,[Year] [INT] NULL,[Week] [INT] NULL,[StartDate] [DATETIME] NULL,[EndDate] [DATETIME] NULL) AS BEGIN DECLARE @YearStartDate DATETIME DECLARE @網站推廣優化seoYearEndDate DATETIME DECLARE @WeekStartDate DATETIME DECLARE @WeekEndDate DATETIME DECLARE @Weeks INT WHILE @StartYear <= @EndYear BEGIN SET @YearStartDate = CAST((CAST(@StartYear AS VARCHAR(4)) + '-01-01') AS DATETIME) SET @YearEndDate= CAST((CAST(@StartYear AS VARCHAR(4))+ '-12-31') AS DATETIME) SET @Weeks = 1 IF DATEPART(DW,@YearStartDate) > 4 SET @YearStartDate = DATEADD(DAY,(8 - DATEPART(DW,@YearStartDate)) ,@YearStartDate) ELSE SET @YearStartDate = DATEADD(DAY,(-(DATEPART(DW,@YearStartDate)-1)),@YearStartDate) SET @WeekStartDatseo網站排名優化軟件e = @YearStartDate SET @WeekEndDate = DATEADD(DAY,6,@WeekStartDate) WHILE DATEDIFF(DAY,@WeekStartDate,@YearEndDate) >= 4 BEGIN INSERT INTO @Week([Year],[Week],[StartDate],[EndDate]) VALUES (@StartYear,@Weeks,@WeekStartDate,@WeekEndDate) SET @Weeks = @Weeks + 1 SET @WeekStartDate = @WeekStartDate + 7 SET @WeekEndDate = @WeekEndDa營銷型網站建設te + 7 END SET @StartYear = @StartYear + 1 END RETURN END

關鍵詞標簽: 自定義 函數