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From: "Josh Berkus" <josh@agliodbs.com>
Subject: Re: simple question!
To: Esteban Gutierrez Abarzua <esgutier@sauce.chillan.ubiobio.cl>,
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Esteban,

>  is there a command intersect? I mean .... exist a union command, but
> I
> don't know if exist a intersect command.
> thanks

Yes.  There is also EXCEPT as well as INTERSECT and UNION.  See the
online docs, in SQL COMMANDS --> SELECT 

-Josh


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