代码如下: 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 */