Keyphrases
- query evaluation
- query language
- data model
- deductive databases
- conjunctive queries
- relational algebra
- data complexity
- query processing
- probabilistic databases
- xml data
- transitive closure
- data management
- expressive power
- machine learning
- regular expressions
- constraint databases
- efficient query evaluation
- database
- query engine
- disjunctive deductive databases
- querying xml documents
- database query languages
- null values
- signature file
- query answers
- complex objects
- inverted lists
- knowledge representation
- data integration
- query processing strategies
- cost model