| From: | "luckyghio(at)katamail(dot)com" <luckyghio(at)katamail(dot)com> |
|---|---|
| To: | pgsql-hackers(at)postgresql(dot)org |
| Subject: | |
| Date: | 2005-12-02 14:41:30 |
| Message-ID: | 62.11.83.58.1907980439.1133534490@webmail.katamail.com |
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| 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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