Keyphrases
- conjunctive queries
- queries using views
- query rewriting
- query answering
- view definitions
- query evaluation
- regular path queries
- integrity constraints
- np complete
- query language
- data complexity
- answering queries using views
- special case
- data exchange
- decision procedures
- probabilistic databases
- query containment
- rewriting queries using views
- schema mappings
- dl lite
- boolean expressions
- database
- view selection
- deductive databases
- answering queries
- expressive power
- unions of conjunctive queries
- data integration