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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