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MSSQL计算两个日期相差的工作天数

if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[f_WorkDay]') and xtype in (N'FN', N'IF', N'TF'))

drop function [dbo].[f_WorkDay]

GO

--计算两个日期相差的工作天数

CREATE FUNCTION f_WorkDay(

@dt_begin datetime,  --计算的开始日期

@dt_end  datetime    --计算的结束日期

)RETURNS int

AS

BEGIN

     declare @i int

     select @i=abs(datediff(dd,@dt_begin,@dt_end))

  declare @t table(dt datetime)

     if @dt_begin>@dt_end

     insert @t select dateadd(dd,number,@dt_end) from master..spt_values

     where number<=@i and type='P'

     else

     insert @t select dateadd(dd,number,@dt_begin) from master..spt_values

     where number<=@i and type='P'

     return(select count(*) from @t where (datepart(weekday,dt)+@@datefirst-1)%7 between 1 and 5)

END

GO

select dbo.f_WorkDay('2009-10-10','2009-10-1')

/*

-----------

7

(1 個資料列受到影響)

*/

if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[f_WorkDay]') and xtype in (N'FN', N'IF', N'TF'))

drop function [dbo].[f_WorkDay]

GO

--计算两个日期相差的工作天数

CREATE FUNCTION f_WorkDay(

@dt_begin datetime,  --计算的开始日期

@dt_end  datetime    --计算的结束日期

)RETURNS int

AS

BEGIN

 DECLARE @workday int,@i int,@bz bit,@dt datetime

 set @workday=0

    IF @dt_begin>@dt_end

  SELECT @bz=1,@dt=@dt_begin,@dt_begin=@dt_end,@dt_end=@dt

 ELSE

  SET @bz=0

    WHILE @dt_begin<=@dt_end

    BEGIN

  SELECT @workday=CASE

     WHEN (@@DATEFIRST+DATEPART(Weekday,@dt_begin)-1)%7 BETWEEN 1 AND 5

  THEN @workday+1 ELSE @workday END,

  @dt_begin=@dt_begin+1

 END

 RETURN(CASE WHEN @bz=1 THEN -@workday ELSE @workday END)

END

GO

select dbo.f_WorkDay('2009-10-10','2009-10-1')

/*

-----------

-7

*/

 

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