Path: utzoo!mnetor!uunet!mcvax!ukc!reading!onion!riddle!john
From: john@riddle.UUCP (Jonathan Leffler)
Newsgroups: comp.databases
Subject: Re: SQL question
Message-ID: <568@riddle.UUCP>
Date: 2 Mar 88 09:06:35 GMT
References: <34358UH2@PSUVM> <43005@sun.uucp> <34586UH2@PSUVM>
Reply-To: john@sphinx.co.uk (Jonathan Leffler)
Organization: Sphinx Ltd., Maidenhead, England
Lines: 13

In article <34586UH2@PSUVM> UH2@PSUVM.BITNET (Lee Sailer) writes:
>So, how come it is said that SQL has only 4 operators, when obviously
>there are more?

There aren't more operators: UNION is part of the SELECT statement.

The SELECT statement in SQL is capable of doing most of the
Relational Calculus operations, including the Relational
Calculus operation called SELECT -- which is very feeble compared
with an SQL select, but absolutely crucial.

#include <disclaimer.h>
Jonathan Leffler (john@sphinx.co.uk)