Query Evaluation with Null Values: How Complex is Completeness?
V. S. LakshmananPublished in: FSTTCS (1989)
Keyphrases
- query evaluation
- null values
- query language
- deductive databases
- query processing
- data management
- probabilistic databases
- transitive closure
- data complexity
- integrity constraints
- relational algebra
- conjunctive queries
- incomplete information
- xml data
- relational databases
- databases
- normal form
- query optimization
- database management systems
- object oriented
- query answers
- database