Extending Relational Algebra and Relational Calculus with Set-Valued Attributes and Aggregate Functions.
Gultekin ÖzsoyogluZ. Meral ÖzsoyogluVictor MatosPublished in: ACM Trans. Database Syst. (1987)
Keyphrases
- relational algebra
- set valued attributes
- relational calculus
- aggregate functions
- expressive power
- relational model
- query language
- normal form
- data model
- relational database systems
- first order logic
- complex objects
- relational data model
- database query languages
- transitive closure
- incomplete information
- recursive queries
- type checking
- relational databases
- object oriented
- data analysis
- data integration
- expert systems