Re: Database design, Keys and some other things
Date: Fri, 30 Sep 2005 12:36:48 +0300
"x" <x_at_not-exists.org> wrote in message
> "JOG" <jog_at_cs.nott.ac.uk> wrote in message
> > Proposition:
> > I am putting forward for discussion that Codd's Information Principle
> > (based on an Liebniz/essentialist viewpoint that an entity is defined
> > by its attributes, and is nothing more and nothing less than the
> > aggregate of them, [Celko - D&DB]) is not a complete model of the
> > nature of information. Rather I am proposing that there is no single
> > attribute of an entity that can be gauranteed to act as a permenant
> > immutable reference for it (nominalism - there are no universals), and
> > so an external one to represent our concept of an entity be provided.
> The usual answer to this is: there must be some way to discriminate among
> any two entities, otherwise how do you know there are two of them.
And if you care which is which, you'll find a way to tell. Received on Fri Sep 30 2005 - 11:36:48 CEST