Semantically Correct Query Answers in the Presence of Null Values
Loreto BravoLeopoldo E. BertossiPublished in: CoRR (2006)
Keyphrases
- null values
- query answers
- query evaluation
- relational algebra
- query answering
- integrity constraints
- probabilistic databases
- incomplete information
- query processing
- aggregate queries
- normal form
- query language
- conjunctive queries
- relational databases
- consistent answers
- databases
- data management
- xml data
- database
- relational model
- data dependencies
- expressive power
- logic programs
- data cleaning
- data cube
- error bounds
- data exchange
- database technology
- uncertain data
- functional dependencies
- user defined
- information retrieval
- machine learning