Estimating Null Values in the Distributed Relational Databases Environment.
Shyi-Ming ChenHsin-Horng ChenPublished in: Cybern. Syst. (2000)
Keyphrases
- null values
- relational databases
- integrity constraints
- data dependencies
- normal form
- functional dependencies
- databases
- incomplete information
- relational algebra
- query evaluation
- distributed systems
- distributed environment
- predicate logic
- distributed data
- dynamic environments
- object oriented
- database
- relational model
- data sources
- database schema
- xml databases
- mobile robot
- multi agent
- knowledge base
- artificial intelligence
- containment of conjunctive queries