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postgres questions (semi-joins, algebraic space)

From: "luckyghio(at)katamail(dot)com" <luckyghio(at)katamail(dot)com>
To: pgsql-hackers(at)postgresql(dot)org
Subject: postgres questions (semi-joins, algebraic space)
Date: 2005-12-02 14:44:41
Message-ID: 62.11.83.58.366842612.1133534681@webmail.katamail.com (view raw or flat)
Thread:
Lists: pgsql-hackers 
 Good Morning,
 I'm an italian student and I'm working on a project involving postgres. I'm sorry for my very bad english. I've some questions:
 1)Does postgres upport semi-joins?
 2)What about projections or selections in query tree writing? Does Postgres support algebraic space (in other word when/how Postgres process 
algebraic operators? Are they used as common to reduce the size of the space that the search strategy has to explore?).
Thanks you all
Lucky

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________________________________________________________________________
Offro&Cerco: CASA, LAVORO, VACANZE, ELETTRONICA, INCONTRI. Tutti gli 
annunci sono online su Kataweb all'indirizzo http://www.offroecerco.it

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