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    PODS
    2005
    ACM
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    On the complexity of division and set joins in the relational algebra
    14 years 5 months ago
    On the complexity of division and set joins in the relational algebra
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    We show that any expression of the relational division operator in the relational algebra with union, difference, projection, selection, constant-tagging, and joins, must produce ...
    Dirk Leinders, Jan Van den Bussche
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