Keyphrases
- conjunctive queries
- directed acyclic graph
- query answering
- query evaluation
- integrity constraints
- np complete
- query language
- data complexity
- query containment
- query rewriting
- transitive closure
- special case
- data exchange
- belief networks
- decision procedures
- probabilistic databases
- unions of conjunctive queries
- boolean expressions
- datalog programs
- regular path queries
- containment of conjunctive queries
- hypertree decomposition
- acyclic conjunctive queries
- data sets
- conjunctive regular path queries
- bounded treewidth
- dl lite
- answering queries
- expressive power
- pattern matching
- description logics
- computational complexity