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CREATE FUNCTION workdayadd( 
@date datetime, --»ù´¡ÈÕÆÚ 
@workday int --ÒªÔö¼ÓµÄ¹¤×÷ÈÕÊý 
)RETURNS datetime 
AS 
BEGIN 
DECLARE @bz int 
--Ôö¼ÓÕûÖܵÄÌìÊý 
SELECT @bz=CASE WHEN @workday<0 THEN -1 ELSE 1 END 
,@date=DATEADD(Week,@workday/5,@date) 
,@workday=@workday%5 
--Ôö¼Ó²»ÊÇÕûÖܵŤ×÷ÌìÊý 
WHILE @workday<>0 
SELECT @date=DATEADD(Day,@bz,@date), 
@workday=CASE WHEN (@@DATEFIRST+DATEPART(Weekday,@date)-1)%7 BETWEEN 1 AND 5 
THEN @workday-@bz ELSE @workday END 
--±ÜÃâ´¦ÀíºóµÄÈÕÆÚÍ£ÁôÔڷǹ¤×÷ÈÕÉÏ 
WHILE (@@DATEFIRST+DATEPART(Weekday,@date)-1)%7 in(0,6) 
SET @date=DATEADD(Day,@bz,@date) 
RETURN(@date) 
END
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  workdayadd('2010-05-06',-8£© ·µ»Ø£º2010-04-26
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