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What is Datalog Query Containment Explained about?

Datalog is a declarative query language similar to Prolog that is more commonly used in databases. Some key points: - Datalog is declarative, specifying the result rather than how to compute it. It supports recursion. - Conjunctive queries (CQs) are the most common type of Datalog query, equivalent to select-project-join queries. - One CQ "contains" another if substituting the variables of the contained query according to a "containment mapping" makes the subgoals of the containing query true. - There

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