Decidability Results on a Query Language for Data Bases with Incomplete Informations.
Hiroakira OnoAkira NakamuraPublished in: MFCS (1980)
Keyphrases
- query language
- data model
- databases
- expressive power
- database systems
- database
- relational algebra
- query evaluation
- conjunctive queries
- query answering
- description logics
- object oriented
- complex objects
- semistructured data
- data base management
- noisy data
- missing data
- missing values
- data sources
- knowledge discovery
- relational databases
- legal information
- language constructs
- recursive queries
- query containment
- information retrieval systems
- uncertain information
- transitive closure
- xml data
- query interface
- artificial intelligence
- regular expressions
- linked data
- data integration