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Re: Another view on analysis and ER

From: Jon Heggland <jon.heggland_at_ntnu.no>
Date: Thu, 06 Dec 2007 15:48:02 +0100
Message-ID: <fj923p$ekq$1@orkan.itea.ntnu.no> 





Quoth Bob Badour:


> Keys and references are logical issues and not physical issues. Physical

> issues affect only performance.




Keys are, but key /primacy/ is not. If one ignores any performance
differences between a primary key and any other key (as of course one
should, although it may not be possible in current SQL systems), the
remaining difference is merely syntactical convenience---hardly a
logical issue.

-- 
Jon


Received on Thu Dec 06 2007 - 08:48:02 CST












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