Null Values in Nested Relational Databases.
Mark A. RothHenry F. KorthAbraham SilberschatzPublished in: Acta Informatica (1989)
Keyphrases
- null values
- relational databases
- normal form
- nested relations
- integrity constraints
- functional dependencies
- relational algebra
- query evaluation
- data dependencies
- databases
- incomplete information
- relational model
- containment of conjunctive queries
- database
- database technology
- object oriented
- predicate logic
- database theory
- xml documents
- sql queries
- inclusion dependencies
- relational database theory
- entity relationship
- xml databases
- database schema
- query answering
- response time
- information retrieval
- keyword search
- update operations
- aggregate functions
- xml data
- query language