Re: object algebra

> > > > RDM's fundamental design ensures NULLs will occur in some applications.
> > >
> > > No, it doesn't. Which applications are you talking about?
> >
> > In any application where a tuple doesn't have all the attributes
> > defined by the relation header.
>
> No, there are no such tuples in existence today

I create a relation named T_Person.
It has attibutes Name and EyeColor.
The first tuple has attribute values John and blue. The second tuple has attribute values Mary and NULL. (She has no eyes).

There now exists at least one tuple containing a NULL. Received on Tue Feb 24 2004 - 21:56:19 CET