Keyphrases
- conjunctive queries
- query answering
- integrity constraints
- query evaluation
- boolean expressions
- data complexity
- np complete
- query language
- data exchange
- special case
- query rewriting
- decision procedures
- probabilistic databases
- query containment
- decision trees
- unions of conjunctive queries
- datalog programs
- conjunctive regular path queries
- tree structure
- data analysis
- bounded treewidth
- queries using views
- incomplete information
- np hard
- answering queries
- database systems
- databases
- containment of conjunctive queries
- conjunctive query containment