Keyphrases
- conjunctive queries
- query answering
- integrity constraints
- query evaluation
- query language
- np complete
- data complexity
- special case
- query containment
- probabilistic databases
- query rewriting
- data exchange
- decision procedures
- datalog programs
- conjunctive query containment
- conjunctive regular path queries
- dl lite
- unions of conjunctive queries
- databases
- database
- expressive power
- query processing
- relational queries
- database systems
- queries using views