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Conjunctive Queries, Existentially Quantified Systems of Equations and Finite Substitutions.
Ján Komara
Published in:
CoRR (2022)
Keyphrases
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conjunctive queries
data complexity
query evaluation
integrity constraints
query answering
query language
np complete
data exchange
databases
graphical models
existentially quantified
search algorithm
expert systems
xml documents
expressive power
unions of conjunctive queries