Re: what are keys and surrogates?

From: Bob Badour <>
Date: Mon, 28 Jan 2008 10:46:32 -0400
Message-ID: <479deace$0$4050$>

David Cressey wrote:

> "Bob Badour" <> wrote in message
> news:479d16f3$0$4055$

>>Logical representations are representations to users. Physical
>>representations are representations to the machine.

> The trouble with this definition is that the user of a machine is frequently
> another machine.
> For example, the "user" of a database is frequently an application program.
> That application program is a machine. It has users.

I fail to see a point in what you wrote.

   To the users of the
> app, the "logical level" is the representation they see. The "physical
> representation" is the representation to the app.

Within the app, yes. But that is beyond the scope of systematically managed data. I don't know why you would even mention such an irrelevancy.

[snip] Received on Mon Jan 28 2008 - 15:46:32 CET

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