Keyphrases
- conjunctive queries
- query answering
- relational database theory
- decision making
- query evaluation
- np complete
- integrity constraints
- database theory
- data exchange
- query language
- query rewriting
- decision rules
- decision procedures
- bounded treewidth
- consistency checking
- acyclic conjunctive queries
- decision problems
- special case
- desirable properties
- probabilistic databases
- query containment
- search algorithm