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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@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.


-- 
Reinier


Received on Thu Dec 06 2007 - 12:36:13 CST












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