Closed World Databases Opened Through Null Values.
Georg GottlobRoberto V. ZicariPublished in: VLDB (1988)
Keyphrases
- null values
- closed world
- databases
- integrity constraints
- relational databases
- query evaluation
- incomplete information
- normal form
- relational algebra
- functional dependencies
- data dependencies
- database
- data model
- database systems
- database applications
- update operations
- query answering
- query language
- deductive databases
- database design
- transitive closure
- predicate logic
- metadata
- object oriented