on 8/21/01 3:29 AM, "Stefan Wagner" <[EMAIL PROTECTED]> wrote:
> Hi!
>
> I got a question regarding the user_id, because I was wondering why it exists
> at all. The login_name is unique already, so why do you create a primary key
> with the user_id? I don't see an advantage.
>
> Thanks for your answers.
>
> Ciao,
> Stefan
If you want to join across tables, joining by an integer id is more
efficient than joining with a string.
-jon
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