Optimal Implementation of Conjunctive Queries in Relational Data Bases
Ashok K. ChandraPhilip M. MerlinPublished in: STOC (1977)
Keyphrases
- conjunctive queries
- query answering
- query evaluation
- integrity constraints
- query language
- databases
- data complexity
- np complete
- relational queries
- data exchange
- data model
- query containment
- query rewriting
- containment of conjunctive queries
- boolean expressions
- probabilistic databases
- special case
- relational databases
- datalog programs
- data sets
- optimal solution
- conjunctive regular path queries
- answering queries
- relational data
- schema mappings
- expressive power
- data integration