Equivalence of Relational Algebra and Relational Calculus Query Languages Having Aggregate Functions.
Anthony C. KlugPublished in: J. ACM (1982)
Keyphrases
- relational calculus
- aggregate functions
- relational algebra
- query language
- expressive power
- data model
- relational model
- relational database systems
- normal form
- recursive queries
- transitive closure
- relational data model
- type checking
- complex objects
- database query languages
- first order logic
- query evaluation
- database
- regular expressions
- structured query language
- conceptual model
- relational algebra expressions
- null values
- query containment
- multi dimensional
- database design