Re: Do Data Models Need to built on a Mathematical Concept?
From: Neo <neo55592_at_hotmail.com>
Date: 3 May 2003 19:44:15 -0700
Message-ID: <4b45d3ad.0305031844.39c67aab_at_posting.google.com>
Date: 3 May 2003 19:44:15 -0700
Message-ID: <4b45d3ad.0305031844.39c67aab_at_posting.google.com>
> > > What are the flaws and limitations you had in mind?
> >
> > 1. That all rows of a table have the same number of columns
> > which leads to the need for NULLs.
>
> There is nothing about relations that require nulls.
Yet they routinely occurs in practice.
Is the model not conforming to reality?
Or is reality not conforming to the model?
IMO, each thing in reality can have different number of attributes which does not match the model. Received on Sun May 04 2003 - 04:44:15 CEST