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Re: Another view on analysis and ER

From: Jon Heggland <jon.heggland_at_ntnu.no>
Date: Thu, 06 Dec 2007 09:35:10 +0100
Message-ID: <fj8c8l$1l3$1@orkan.itea.ntnu.no> 





Quoth Bob Badour:


> David Cressey wrote:


>> This could have consequences for performance,  ease of
>> programming,  "natural joins" etc. etc.




> 

> Performance is independent of choices at the logical level of discourse

> where one identifies candidate keys or designates primary keys.




Minor point: Is designation of primary keys really at the logical level?
Are there any substantial logical consequences?

-- 
Jon


Received on Thu Dec 06 2007 - 02:35:10 CST












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