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_at_orkan.itea.ntnu.no>
>
> Performance is independent of choices at the logical level of discourse
> where one identifies candidate keys or designates primary keys.
Date: Thu, 06 Dec 2007 09:35:10 +0100
Message-ID: <fj8c8l$1l3$1_at_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?
-- JonReceived on Thu Dec 06 2007 - 09:35:10 CET