Keyphrases
- conjunctive queries
- query answering
- integrity constraints
- query evaluation
- data complexity
- query language
- np complete
- query rewriting
- data exchange
- special case
- probabilistic databases
- query containment
- datalog programs
- decision procedures
- boolean expressions
- database
- regular path queries
- conjunctive query containment
- incomplete information
- data integration
- unions of conjunctive queries
- tuple generating dependencies
- containment of conjunctive queries
- conjunctive regular path queries