Re: Does Codd's view of a relational database differ from that ofDate&Darwin?[M.Gittens]

From: Gene Wirchenko <>
Date: Mon, 11 Jul 2005 14:02:37 -0700
Message-ID: <>

On 11 Jul 2005 11:17:44 -0700, "Mikito Harakiri" <> wrote:


>I am confused by this POSREP thingy. Especially when it is something
>not supported by actually implemented system.

     Many programming languages have something like that. You can output a value in a number of forms. POSSREP just extends the idea.

>More important, however, what is all this referring to mathematical
>examples (Circle-Ellipse, Polar-Cartesian) in order to make some
>retarded OOP point? The correspondence between cartesian and polar is

     Please do not be rude.

>*interesting* from mathematical perspective. Ditto Circle-Ellipse. It

     It is a well-known example of POSSREP as is the temperature example.

>is treated as implementation detail from OOP perspective. If the type
>details are hidden behing some (procedural) code, it leaves no
>possibilities for expression rewriting, optimization, etc.

     The procedures might be optimised.


Gene Wirchenko Received on Mon Jul 11 2005 - 23:02:37 CEST

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