Titlebook: Deductive and Object-Oriented Databases; Third International Stefano Ceri,Katsumi Tanaka,Shalom Tsur Conference proceedings 1993 Springer-

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Ronald Hitzler,Michaela Pfadenhauerbe used to express both user level queries as well as low-level evaluation strategies or access plans. This property enables rule-based query optimization to be viewed as the process of . expressions in such a language: “non-procedural” sub-expressions are gradually replaced by more “procedural” sub

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