Constraints check: TRY/CATCH vs Exists()

Question

I have a table with unique constraint on it:

create table dbo.MyTab
(
    MyTabID int primary key identity,
    SomeValue nvarchar(50)
);
Create Unique Index          


        

Answer 1

Why not implement a INSTEAD OF INSERT trigger on the table? You can check if the row exists, do nothing if it does, and insert the row if it doesn't.