Re: Another view on analysis and ER
From: rpost <rpost_at_pcwin518.campus.tue.nl>
Date: Thu, 06 Dec 2007 19:36:13 +0100
Message-ID: <94807$4758411d$839b4533$21800_at_news1.tudelft.nl>
Date: Thu, 06 Dec 2007 19:36:13 +0100
Message-ID: <94807$4758411d$839b4533$21800_at_news1.tudelft.nl>
Jon Heggland wrote:
[...]
>You define relationships as anything that can be identified /only/ by
>its related entitites---if there is an alternate key, the thing is an
>entity. Correct? What is the rationale behind this rule?
It's the common definition. At least Silberschatz/Korth/Sudarshan defines it this way.
-- ReinierReceived on Thu Dec 06 2007 - 19:36:13 CET