Re: object algebra
From: Neo <neo55592_at_hotmail.com>
Date: 28 Feb 2004 12:10:13 -0800
Message-ID: <4b45d3ad.0402281210.5afca862_at_posting.google.com>
Date: 28 Feb 2004 12:10:13 -0800
Message-ID: <4b45d3ad.0402281210.5afca862_at_posting.google.com>
> You're incorrect in assuming that nulls arise from RDM naturally.
> Codd said that (sort of), and Date refuted it.
The rules of RDM trump even Date, regardless of his wish for a NULL-less RDM. The very definition of a relation which optimizes RDM for a limited scope of all that is possible under relational algebra, is also the cause of NULLs when applications fall beyond RDM's scope. Received on Sat Feb 28 2004 - 21:10:13 CET