Keyphrases
- query language
- expressive power
- deductive databases
- query answering
- datalog programs
- data model
- transitive closure
- logic programming
- relational algebra
- integrity constraints
- object oriented
- data sets
- containment of conjunctive queries
- data complexity
- conjunctive queries
- data exchange
- case study
- query evaluation
- data integration
- multimedia
- social networks
- relational calculus
- datalog queries
- database
- ontology based data access