Efficient and Optimal Query Answering on Independent Schemes.
Paolo AtzeniEdward P. F. ChanPublished in: Theor. Comput. Sci. (1990)
Keyphrases
- query answering
- data exchange
- data integration
- conjunctive queries
- data complexity
- integrity constraints
- incomplete information
- inconsistent databases
- answering queries
- data integration systems
- query answers
- databases
- expressive power
- data management
- schema mappings
- data analysis
- case study
- deductive databases
- decision making
- datalog programs
- query containment
- query relaxation