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    ICDT
    2009
    ACM
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    Containment of conjunctive queries on annotated relations
    15 years 1 months ago
    Containment of conjunctive queries on annotated relations
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    We study containment and equivalence of (unions of) conjunctive queries on relations annotated with elements of a commutative semiring. Such relations and the semantics of positiv...
    Todd J. Green
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