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PODS
2010
ACM
242views Database» more  PODS 2010»
Certain answers for XML queries
10 years 8 months ago
Certain answers for XML queries
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The notion of certain answers arises when one queries incompletely speciļ¬ed databases, e.g., in data integration and exchange scenarios, or databases with missing information. W...
Claire David, Leonid Libkin, Filip Murlak
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LPNMR
2009
Springer
150views Automated Reasoning» more  LPNMR 2009»
Complexity of the Stable Model Semantics for Queries on Incomplete Databases
10 years 9 months ago
Complexity of the Stable Model Semantics for Queries on Incomplete Databases
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Abstract. We study the complexity of consistency checking and query answering on incomplete databases for languages ranging from non-recursive Datalog to disjunctive Datalog with n...
Jos de Bruijn, Stijn Heymans
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