A Unified Treatment of Null Values Using Constraints.
K. Selçuk CandanJohn GrantV. S. SubrahmanianPublished in: Inf. Sci. (1997)
Keyphrases
- null values
- integrity constraints
- relational databases
- data dependencies
- normal form
- incomplete information
- relational algebra
- databases
- functional dependencies
- query evaluation
- update operations
- relational database theory
- relational model
- information retrieval
- predicate logic
- database
- database management systems
- natural language processing
- containment of conjunctive queries