Re: Relational Calculus Operators. TRC and DRC in details please

From: Jonathan Leffler <jleffler_at_earthlink.net>
Date: Mon, 08 Sep 2003 05:09:24 GMT
Message-ID: <8aU6b.3203$PE6.3083@newsread3.news.pas.earthlink.net>

sibun wrote:

> I cant find the meanings of different Relational Calnulus operators used
> in TRC and DRC too. Cant understand the utility of Rel. Calculus at the
> first place.
>
> Help Any one Plz

You might need to explain what TRC and DRC are before anyone can help you. At least, they are not acronyms I'm familiar with.

Relational Calculus is an alternative to Relational Algebra, and is equivalent to it. It is a way of asking questions of a database.

-- 
Jonathan Leffler                   #include <disclaimer.h>
Email: jleffler_at_earthlink.net, jleffler_at_us.ibm.com
Guardian of DBD::Informix v2003.04 -- http://dbi.perl.org/

Received on Mon Sep 08 2003 - 00:09:24 CDT