The Power of Tree Projections: When Local Consistency Answers Conjunctive Queries
Gianluigi GrecoFrancesco ScarcelloPublished in: CoRR (2012)
Keyphrases
- conjunctive queries
- queries using views
- query answering
- query evaluation
- integrity constraints
- data complexity
- np complete
- query answers
- query language
- boolean expressions
- tree patterns
- data exchange
- query rewriting
- probabilistic databases
- query containment
- regular path queries
- special case
- tree structure
- decision procedures
- expressive power
- containment of conjunctive queries
- datalog programs
- conjunctive query containment
- regular expressions
- r tree
- transitive closure
- answering queries
- pattern matching
- relational queries
- data integration
- index structure
- unions of conjunctive queries
- primary key
- schema mappings
- query processing
- deductive databases