Re: Relational algebra grammar?
From: Amund Trovåg <st08661_at_rasmus.uib.no>
Date: Wed, 03 Sep 2003 17:00:17 +0200
Message-ID: <bj4vlm$m3u$1_at_toralf.uib.no>
>
>
>
> You can find a grammar for Tutorial D at the following URL; although,
> it's not quite you want:
> http://www.hughdarwen.freeola.com/TheThirdManifesto.web/D.GRM
>
> One can invent any number of formal definitions of the relational
> algebra depending on which operations one chooses as primitives.
Date: Wed, 03 Sep 2003 17:00:17 +0200
Message-ID: <bj4vlm$m3u$1_at_toralf.uib.no>
Bob Badour wrote:
> Amund Trovåg <st08661_at_rasmus.uib.no> wrote in message news:<bj1r65$19da$1@toralf.uib.no>...
>
>>Hello. >> >>I was wondering where I could find a formal definition of the relational >>algebra grammar.
>
>
>
> You can find a grammar for Tutorial D at the following URL; although,
> it's not quite you want:
> http://www.hughdarwen.freeola.com/TheThirdManifesto.web/D.GRM
>
> One can invent any number of formal definitions of the relational
> algebra depending on which operations one chooses as primitives.
Thanks, Mr. Badour.
The operations I am going to define are restrict(select), project, product(Cartesian Product), union and difference. These constitute the minimal set, and is all I need for my studies. The webpage you refer to has given me some ideas, thank you for that.
Sincerely, Amund Trovåg Received on Wed Sep 03 2003 - 17:00:17 CEST