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    PODS
    2009
    ACM
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    Reverse data exchange: coping with nulls
    14 years 5 months ago
    Reverse data exchange: coping with nulls
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    An inverse of a schema mapping M is intended to "undo" what M does, thus providing a way to perform "reverse" data exchange. In recent years, three different f...
    Ronald Fagin, Phokion G. Kolaitis, Lucian Popa, Wa...
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