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query_equivalence (334B)

      1 # Query equivalence
      2 
      3 Two [Boolean_queries] Q and Q' are *equivalent* if they are satisfied on precisely the same [databases].
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      5 For non-Boolean [queries], on every [database] the [set] of returned [answers] should be the same
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      7 [Computational_problem]: [query_equivalence_problem]
      8 
      9 Up: [equivalence], [query]
     10 
     11 Aliases: query_equivalent