Conjunctive queries with negation

  • Tractability Beyond ß-Acyclicity for Conjunctive Queries with Negation

    The class UCQ (Union of Conjunctive Queries) is obtained by adding union to conjunctive queries.
    A UCQ is a query of the form q1 ∪ q2 ∪ qm, where each qi is a conjunctive query..

  • [PDF] Containment of Conjunctive Queries with Safe Negation

    The class UCQ (Union of Conjunctive Queries) is obtained by adding union to conjunctive queries.
    A UCQ is a query of the form q1 ∪ q2 ∪ qm, where each qi is a conjunctive query..

  • [PDF] Lecture 1: Conjunctive Queries - cswiscedu

    The class UCQ (Union of Conjunctive Queries) is obtained by adding union to conjunctive queries.
    A UCQ is a query of the form q1 ∪ q2 ∪ qm, where each qi is a conjunctive query..

A conjunctive query with negation (CQ¬) is of the form: q = ans(x1 xq) ← p1, ,pn,n1, ,nm, where each pi (resp. ni ) is a positive (resp. negative) subgoal, 1 ≤ n + m, and ans is a special relation (which defines the answer part of the query).

Categories

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Union of conjunctive queries
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