The name certainly does provide logical identity with respect to a single
database state, and it is indeed a natural key. But natural key values are
mutable; consequently, the logical identity one provides is not guaranteed
to be the same in more than one database state. Hence the need for a second
immutable key.
"Anith Sen" <anith_at_bizdatasolutions.com> wrote in message
news:dtvcju$b64$1_at_emma.aioe.org...
>>> By revealing an attribute that reflects the identity of a proposition
>>> with respect to all other propositions in the database.
>
> So since name provides no logical identity, it is not the key as you
> stated before, right?
>
> --
> Anith
>
Received on Mon Feb 27 2006 - 11:50:53 CST
