急、 SQL语句高手帮帮忙。。

[Ni_Yang]

 ALTER proc [dbo].[usp_ProColour_Sup_Add]
(@SupplierNO varchar(50),
@ProNO varchar(50),
@ColourNO varchar(50),
@Flag int 
)
as
insert ProColour_Sup (SupplierNO,ProNO,ColourNO,Flag)
values(@SupplierNO ,@ProNO,@ColourNO,@Flag)

这是我一个添加一条记录的储存过程。。 但是没有判断表里是否已经有了。 我想做个判断。哪个高手帮下忙。。

[快溜]

ALTER proc [dbo].[usp_ProColour_Sup_Add]
(@SupplierNO varchar(50),
@ProNO varchar(50),
@ColourNO varchar(50),
@Flag int 
)
as
begin
     if not exists(select 1 from ProColour_Sup where SupplierNO=@SupplierNO)
        insert ProColour_Sup (SupplierNO,ProNO,ColourNO,Flag)
               values(@SupplierNO ,@ProNO,@ColourNO,@Flag)
end

[cs_lb]

ALTER proc [dbo].[usp_ProColour_Sup_Add]
(@SupplierNO varchar(50),
@ProNO varchar(50),
@ColourNO varchar(50),
@Flag int 
)
AS
IF NOT EXISTS(SELECT 1 FROM ProColour_Sup WHERE SupplierNO=@SupplierNO AND ProNO=@ProNO AND ColourNO=@ColourNO AND Flag=@Flag)
insert ProColour_Sup (SupplierNO,ProNO,ColourNO,Flag)
values(@SupplierNO ,@ProNO,@ColourNO,@Flag)

[laowang134]

ALTER proc [dbo].[usp_ProColour_Sup_Add]
(@SupplierNO varchar(50),
@ProNO varchar(50),
@ColourNO varchar(50),
@Flag int 
)
as
declare @count int
select @count=count(1) from ProColour_Sup where SupplierNO=@SupplierNO and ProNO=@ProNO and ColourNO=@ColourNO and Flag=@Flag
if @count<1
begin
insert ProColour_Sup (SupplierNO,ProNO,ColourNO,Flag)
values(@SupplierNO ,@ProNO,@ColourNO,@Flag)
end