> Richard, thanks. in my case, the primary key isn't
> relevant, however, the product_number is (it is
> unique). iiuc, in my case i should use product_number
> instead of primarykey.
Sure, the "primarykey" that I showed was just to express the general idea. Any unique column ( or
unique column combinations) would work perfectly as well.
Regards,
Richard Broersma Jr.