Bag Equivalence of Bounded Symmetry-Degree Conjunctive Queries with Inequalities.
Mingmin ChenTodd J. GreenPublished in: AMW (2011)
Keyphrases
- conjunctive queries
- query containment
- datalog programs
- query answering
- bounded treewidth
- query evaluation
- data complexity
- integrity constraints
- np complete
- hypertree width
- query language
- special case
- query rewriting
- data exchange
- fixed parameter tractable
- probabilistic databases
- regular path queries
- boolean expressions
- containment of conjunctive queries
- tight complexity bounds
- decision procedures
- expressive power
- queries using views
- conjunctive regular path queries
- deductive databases
- schema mappings
- transitive closure
- incomplete information
- np hard
- database systems
- database