Question

考虑以下脚本：

SET LANGUAGE 'German'
GO
SET DATEFIRST 1
GO

DECLARE @FullDate DATETIME
DECLARE @DayofWeek tinyint
DECLARE @relativeWeek int

SELECT @FullDate  = '5/1/2008'
WHILE (@FullDate <= '7/1/2008')
BEGIN

SELECT DATEPART (DW , @FullDate) as day_of_week, DATEDIFF(WEEK, CURRENT_TIMESTAMP, @FullDate) as relative_week

SELECT @FullDate = DATEADD(DAY, 1, @Fulldate)
END

目前的结果是

day_of_week   relative_week
----------------------------
6   -220
7   -219
1   -219

现在我如何设法得到这样的结果：

day_of_week   relative_week
----------------------------
6   -220
7   -220 <-- here's the difference :) 
1   -219

意思是在星期一/星期一的第一周开始。如您所见，将datefirst变量设置为1没有效果。

提前致谢。

Answer 1

请参阅：http://social.msdn.microsoft.com/Forums/en-US/transactsql/thread/8cc3493a-7ae5-4759-ab2a-e7683165320b/

希望它有所帮助。

事实上 - DATEDIFF并不关心DATEFIRST

将周开始设置为星期一 - datefirst无效

1 个答案: