Null Values Revisited in Prospect of Data Integration.
Guy De TréRita M. M. De CaluweHenri PradePublished in: ICSNW (2004)
Keyphrases
- data integration
- null values
- databases
- integrity constraints
- data model
- relational algebra
- relational databases
- query evaluation
- data management
- normal form
- incomplete information
- data exchange
- data sources
- data sharing
- functional dependencies
- data cleaning
- query answering
- data dependencies
- database
- heterogeneous data
- data warehouse
- database systems
- database schema
- predicate logic
- relational model
- heterogeneous data sources
- data warehousing
- schema mappings
- update operations
- conjunctive queries
- query decomposition
- business intelligence
- database management systems
- query language
- database applications
- query rewriting
- data analysis
- data access
- expressive power
- query optimization
- xml data
- object oriented
- data mining
- data sets