Keyphrases
- query answering
- answering queries
- query answers
- query containment
- query rewriting
- data exchange
- query relaxation
- conjunctive queries
- data integration systems
- unions of conjunctive queries
- integrity constraints
- data complexity
- incomplete information
- data integration
- inconsistent databases
- xml data exchange
- complexity of query answering
- query processing
- probabilistic databases
- query evaluation
- open world
- probabilistic inference
- regular path queries
- relational queries
- tuple generating dependencies
- dl lite
- range queries
- consistent query answering
- data sources
- query language
- databases
- datalog programs
- closed world assumption
- query complexity
- error bounds
- aggregate queries