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ÖØÐ´SQL Server DateDiffº¯Êý

--½«ÏµÍ³datediffº¯ÊýÖØÐ´£¬Ö÷Òª°ÑdatepartÀàÐ͸ÄΪvarhcar£¬·½±ãµ÷ÓÃ
--×÷Õß:°½Ê¿Î°
--Date:2009-10-14 10:29
create function MyDateDiff(@datepart varchar(50), --ÈÕÆÚ¼ä¸ôÀàÐÍ:year,month,day.etc
@date1 varchar(50), @date2 varchar(50))
returns int
as
begin
 declare @part int
 if @datepart='year'
  begin
   set @part=datediff(year,@date1,@date2)
  end
 if @datepart='month'
  begin
   set @part=datediff(month,@date1,@date2)
  end
 if @datepart='day'
  begin
   set @part=datediff(day,@date1,@date2)
  end
 if @datepart='week'
  begin
   set @part=datediff(week,@date1,@date2)
  end
 if @datepart='hour'
  begin
   set @part=datediff(hour,@date1,@date2)
  end
 if @datepart='minute'
  begin
   set @part=datediff(minute,@date1,@date2)
  end
 if @datepart='second'
  begin
   set @part=datediff(second,@date1,@date2)
  end
 return(@part)
end --½áÊøº¯Êý¶¨Òå


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