Counting Solutions to Conjunctive Queries: Structural and Hybrid Tractability.
Gianluigi GrecoFrancesco ScarcelloPublished in: SEBD (2014)
Keyphrases
- conjunctive queries
- np complete
- query answering
- data complexity
- integrity constraints
- query evaluation
- data exchange
- query language
- query containment
- query rewriting
- special case
- unions of conjunctive queries
- containment of conjunctive queries
- computational complexity
- optimal solution
- constraint satisfaction
- probabilistic databases
- conjunctive query containment
- boolean expressions
- bounded treewidth
- decision procedures
- deductive databases
- tuple generating dependencies