Keyphrases
- conjunctive queries
- query answering
- query evaluation
- integrity constraints
- data complexity
- np complete
- query language
- data exchange
- query rewriting
- special case
- decision procedures
- query containment
- probabilistic databases
- datalog programs
- bounded treewidth
- boolean expressions
- conp complete
- containment of conjunctive queries
- incomplete information
- data integration
- relational queries
- conjunctive query containment
- schema mappings
- query processing