Keyphrases
- conjunctive queries
- query evaluation
- query answering
- integrity constraints
- query language
- data complexity
- data exchange
- np complete
- special case
- query rewriting
- decision procedures
- query containment
- datalog programs
- boolean expressions
- probabilistic databases
- schema mappings
- data model
- unions of conjunctive queries
- conp complete
- conjunctive query containment
- relational algebra
- relational queries
- database
- data mining