----- Original Message -----
From: <zifnabbe@...>
> This approach requires to have a primary key with 2 fields, correct?
>
Yeap. But Helen post a message with lot's of more details. I like to have a
field with 'Location/Origin' on this type of DB's. You will never know when
you will use it, and it's a small field that will not impact the growing of
your DB.

Artur Anjos