Re: object algebra

"Jonathan Leffler" <jleffler_at_earthlink.net> wrote in message news:xUT1c.19803$yZ1.15015_at_newsread2.news.pas.earthlink.net...
> Neo wrote:
>
> >>>You're confusing missing information and nulls.
> >>>RDM creates NULLs when information required by a tuple is missing.
> >>
> >>Can you illustrate? Which operator(s) create(s) nulls? Are you sure
> >>that operator is in the TTM version of the RDM? Which version of the
> >>RDM are you assuming - or, if you prefer, whose exposition of the RDM
> >>are you using?
> >
> > The creation of NULLs in RDM is rooted in its definition of a
> > relation.
>
> I've nearly reached the point of not responding, but I'll make one
> more attempt for good meaasure.

Don't do it! Stay out of the water! Danger Will Robinson!

> Please can you explain the definition of a relation which you think
> means that the RDM must create nulls? And can you give a reference to
> where the version of the RDM you are using or assuming is defined? It
> doesn't seem to be the same as the version(s) I'm used to.

Oh, now ya gone and done it...

• Eric "I gave up and man, do I feel fine!" Kaun