Tractable Query Answering over Conceptual Schemata.
Andrea CalìGeorg GottlobAndreas PierisPublished in: ER (2009)
Keyphrases
- query answering
- data exchange
- data complexity
- integrity constraints
- answering queries
- conjunctive queries
- data integration
- incomplete information
- complexity of query answering
- functional dependencies
- database schema
- conceptual model
- inconsistent databases
- data integration systems
- np complete
- query rewriting
- entity relationship
- computational complexity
- relational databases
- datalog programs
- ontology languages
- query containment
- data management
- expert systems
- data warehouse
- schema mappings
- ontology based data access
- databases