Semantic Acyclicity for Conjunctive Queries: Approximations and Constraints.
Pablo BarcelóPublished in: WoLLIC (2016)
Keyphrases
- conjunctive queries
- query answering
- data exchange
- query containment
- bounded treewidth
- regular path queries
- data complexity
- integrity constraints
- query evaluation
- np complete
- tuple generating dependencies
- query language
- datalog queries
- null values
- query rewriting
- decision procedures
- primary key
- boolean expressions
- datalog programs
- answering queries
- probabilistic databases
- special case
- natural language
- conp complete
- containment of conjunctive queries
- incomplete information
- data integration
- inconsistent databases
- regular expressions
- schema mappings
- inclusion dependencies
- fixed parameter tractable
- data management
- queries using views
- semantic web
- data warehouse
- data mining