Oracle FAQ Your Portal to the Oracle Knowledge Grid
HOME | ASK QUESTION | ADD INFO | SEARCH | E-MAIL US
 

Home -> Community -> Usenet -> comp.databases.theory -> Re: c.d.theory glossary - RELATION

Re: c.d.theory glossary - RELATION

From: x <x-false_at_yahoo.com>
Date: Fri, 30 Apr 2004 17:36:51 +0300
Message-ID: <409263cf$1@post.usenet.com>

"mAsterdam" <mAsterdam_at_vrijdag.org> wrote in message news:40925ec4$0$574$e4fe514c_at_news.xs4all.nl...

> This is where a difference come in:
>
> In ER-modelling the parts of the model are
> abstractions of (real or fantasized) world _things_
> and associatons between them, vs.
> the relation values in a relational model represent _facts_
> (or beliefs) about a (real or fantasized) world.
>
> In short
> RM.REPRESENT yes, *facts*.
> ER.REPRESENT yes, *things*.
>

Do some of the _facts_ about a (real or fantasized) world tell something about _things_ in a (real or fantasized) world ?

If yes, those _things_ are explicitly or implicitly represented in relational model ? And by what ? Why not otherwise.

-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

Received on Fri Apr 30 2004 - 09:36:51 CDT

Original text of this message

HOME | ASK QUESTION | ADD INFO | SEARCH | E-MAIL US