Re: object algebra
From: Neo <neo55592_at_hotmail.com>
Date: 3 Mar 2004 17:41:57 -0800
Message-ID: <4b45d3ad.0403031741.3f20fa0e_at_posting.google.com>
Date: 3 Mar 2004 17:41:57 -0800
Message-ID: <4b45d3ad.0403031741.3f20fa0e_at_posting.google.com>
> > Given the table:
> > Person EyeColor
> > ------ --------------
> > Mary NOT_APPLICABLE
> > Bob NOT_APPLICABLE
> >
> > Then, Mary.EyeColor equals Bob.EyeColor
>
> No. You're free to define the domain and its operations as you wish.
One should define things according to reality otherwise one can get results that are correct within the system but meaningless or incorrect in reference to reality. For example, Newtonian will provide answers that they don't match reality under some conditions. Same thing occurs with RDM when working with NULLs or masks for those NULLs (ie NA). Received on Thu Mar 04 2004 - 02:41:57 CET