Re: Another view on analysis and ER

From: Jon Heggland <>
Date: Thu, 06 Dec 2007 09:35:10 +0100
Message-ID: <fj8c8l$1l3$>

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?

Received on Thu Dec 06 2007 - 09:35:10 CET

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