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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/howPostgres 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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