Keyphrases
- conjunctive queries
- query evaluation
- formal concept analysis
- query answering
- integrity constraints
- np complete
- data complexity
- data exchange
- query language
- programming language
- query rewriting
- special case
- probabilistic databases
- decision procedures
- query containment
- boolean expressions
- containment of conjunctive queries
- bounded treewidth
- deductive databases
- unions of conjunctive queries
- data sets
- datalog programs
- object oriented
- query processing
- databases