Re: Key attributes with list values was Re: What are the differences ...KEY
Date: Mon, 27 Feb 2006 17:50:53 GMT
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
>>> 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?
Received on Mon Feb 27 2006 - 18:50:53 CET