Question

这是我用来创建日历的语法。我遇到的问题是，由于Week1的开始日期是2012年，因此startdate显示为null。有没有办法让startdate（或其他实例中的enddate）填充，即使它在不同的年份？ @变革之风 - - 这会添加一个开始日期和结束日期，之前它是null。但我所追求的是，例如，我需要我的日期范围来运行星期六 - 星期三。所以让我们在2013年的第53周。日期范围应该是12/28/2013 - 01/01/14。有没有办法修改压延机以这种格式显示？

CREATE TABLE dbo.Calendar (
    CalendarYear INT NOT NULL,
    CalendarWeek INT NOT NULL,
    WeekStartDate VARCHAR(50),
    WeekEndDate VARCHAR(50),
    CONSTRAINT PK_Calendar PRIMARY KEY (
        CalendarYear,
        CalendarWeek
        )
    )

SET DATEFIRST 6

DECLARE @StartDate DATETIME,
    @NumOfDays INT

SET @StartDate = '20130101'
SET @NumOfDays = 1000;

WITH calendar
AS (
    SELECT TOP (@NumOfDays) dateadd(day, row_number() OVER (
                ORDER BY sc1.column_id
                ) - 1, @StartDate) AS CalendarDate
    FROM sys.columns sc1
    CROSS JOIN sys.columns sc2
    )
INSERT INTO dbo.Calendar (
    CalendarYear,
    CalendarWeek,
    WeekStartDate,
    WeekEndDate
    )
SELECT DATEPART(year, c.CalendarDate) AS Year,
    convert(VARCHAR(100), DATEPART(week, c.CalendarDate)) AS Week, --DATEPART(week, c.CalendarDate) AS Week,    
    MAX(CASE DATEPART(WEEKDAY, c.CalendarDate)
            WHEN 1
                THEN convert(VARCHAR(50), c.CalendarDate, 101)
            ELSE NULL
            END) AS StartDate,
    MAX(CASE DATEPART(WEEKDAY, c.CalendarDate)
            WHEN 7
                THEN convert(VARCHAR(50), c.CalendarDate, 101)
            ELSE NULL
            END) AS EndDate
FROM calendar c
GROUP BY DATEPART(year, c.CalendarDate),
    DATEPART(Week, c.CalendarDate)
ORDER BY Year,
    startdate,
    convert(VARCHAR(100), DATEPART(week, c.CalendarDate)) --Week

SELECT *
FROM dbo.Calendar

Answer 1

所以你的问题是你按周和年分组，但是在年初或年末，年份在不同的一周开始/结束。因此，如果第一周从星期三开始，那一年只有3天的星期。

我有一个小小的修补程序，我已经让它工作，以便通过改变一切来显示一年中的第一天/最后一天作为一周的开始/结束日期。这是我的修改版本：

SELECT
   DATEPART(year, c.CalendarDate) AS Year,
   convert(VARCHAR(100), DATEPART(week, c.CalendarDate)) AS Week, --DATEPART(week, c.CalendarDate) AS Week,    
   convert(VARCHAR(50), MIN(c.CalendarDate), 101) AS StartDate,
   convert(VARCHAR(50), MAX(c.CalendarDate), 101) AS EndDate
FROM 
   calendar c
GROUP BY 
   DATEPART(year, c.CalendarDate),
   DATEPART(Week, c.CalendarDate)
ORDER BY 
   Year,
   startdate,
   convert(VARCHAR(100), DATEPART(week, c.CalendarDate)) --Week

希望这有帮助。

编辑：在回复您的评论/编辑时，请查看这些更新语句。插入后放入它们。

EDIT2：请勿使用上述插件以及更新。

update dbo.Calendar set WeekStartDate = convert(VARCHAR(50), dateadd(day, 1, dateadd(week, -1, cast(WeekEndDate as datetime))), 101)
where WeekStartdate is null

update dbo.Calendar set WeekEndDate = convert(VARCHAR(50), dateadd(day, -1, dateadd(week, 1, WeekStartDate)), 101)
where WeekEndDate is null

日期在上一年开始时显示为空的日历

1 个答案: