Re: Proposal: 6NF
From: Jan Hidders <hidders_at_gmail.com>
Date: 7 Oct 2006 00:57:02 -0700
Message-ID: <1160207822.376782.152040_at_i42g2000cwa.googlegroups.com>
Date: 7 Oct 2006 00:57:02 -0700
Message-ID: <1160207822.376782.152040_at_i42g2000cwa.googlegroups.com>
J M Davitt schreef:
> >
> > Given the definition of NULL that I typically use (with non-SQL based
> > solutions), NULL is a value and can be modeled mathematically with the
> > empty set. In that case, a relation tuple with a NULL is as valid
> > mathematically as one without. Agreed? --dawn
>
> Well, if it's merely a matter of definition, then, "No. Not agreed."
Since Dawn defines NULL as the empty set your answer implies that you
think the empty set is not a value. Why?
Received on Sat Oct 07 2006 - 09:57:02 CEST