急。。。。。。SQL语句高手帮帮忙。。

Question

 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。。

Answer 1

if exists (select 1 from ProUser_Sup where 条件)
begin
insert语句
end

Answer 2

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

Answer 3

ALTER proc [dbo].[usp_ProColour_Sup_Add]
(@SupplierNO varchar(50),
@ProNO varchar(50),
@ColourNO varchar(50),
@Flag int 
)
ASDECLARE @count INTSELECT @count=COUNT(SupplierNO) FROM ProColour_Sup WHERE SupplierNO=@SupplierNOIF(@count=0)
begin
insert ProColour_Sup (SupplierNO,ProNO,ColourNO,Flag)
values(@SupplierNO ,@ProNO,@ColourNO,@Flag)
END