Expressive Power of Query Languages for Constraint Complex Value Databases.
Hong-Cheu LiuPublished in: DASFAA (2) (2011)
Keyphrases
- expressive power
- query language
- databases
- data model
- relational algebra
- first order logic
- database
- computational properties
- transitive closure
- relational calculus
- data complexity
- aggregate functions
- recursive queries
- relational databases
- knowledge discovery
- relational data model
- conjunctive queries
- relation algebra
- relational query languages
- query evaluation
- artificial intelligence
- incomplete information
- database applications
- np complete
- object oriented