Re: Proposal: 6NF

J M Davitt schreef:

> dawn wrote:
> >
> > 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?

• Jan Hidders