Optimization of a Subclass of Conjunctive Queries.
Joachim BiskupPratul DublishYehoshua SagivPublished in: Acta Informatica (1995)
Keyphrases
- conjunctive queries
- np complete
- query evaluation
- integrity constraints
- query answering
- data complexity
- query language
- special case
- data exchange
- probabilistic databases
- decision procedures
- query containment
- containment of conjunctive queries
- conjunctive regular path queries
- boolean expressions
- datalog programs
- query rewriting
- deductive databases
- regular path queries
- data sets
- incomplete information
- data management
- data warehouse
- np hard
- computational complexity