Counting solutions to conjunctive queries: structural and hybrid tractability.
Gianluigi GrecoFrancesco ScarcelloPublished in: PODS (2014)
Keyphrases
- conjunctive queries
- np complete
- query answering
- query evaluation
- integrity constraints
- data complexity
- query language
- query containment
- data exchange
- decision procedures
- query rewriting
- special case
- boolean expressions
- bounded treewidth
- probabilistic databases
- queries using views
- np hard
- data model
- datalog programs
- computational complexity
- optimal solution
- multi agent systems
- containment of conjunctive queries
- conjunctive query containment
- data sets
- conjunctive regular path queries
- conp complete
- expressive power
- constraint satisfaction problems
- query processing
- database systems