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    PODS
    2004
    ACM
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    On Preservation under Homomorphisms and Unions of Conjunctive Queries
    14 years 4 months ago
    On Preservation under Homomorphisms and Unions of Conjunctive Queries
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    Unions of conjunctive queries, also known as select-project-join-union queries, are the most frequently asked queries in relational database systems. These queries are definable b...
    Albert Atserias, Anuj Dawar, Phokion G. Kolaitis
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