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    ICDT
    2007
    ACM
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    Containment of Conjunctive Queries over Databases with Null Values
    13 years 10 months ago
    Containment of Conjunctive Queries over Databases with Null Values
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    Abstract. We study containment of conjunctive queries that are evaluated over databases that may contain tuples with null values. We assume the semantics of SQL for single block qu...
    Carles Farré, Werner Nutt, Ernest Teniente,...
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