Relational Algebra and Calculus with SQL Null Values.
Enrico FranconiSergio TessarisPublished in: CoRR (2022)
Keyphrases
- null values
- relational algebra
- relational calculus
- relational model
- database query languages
- query language
- expressive power
- relational database systems
- data model
- normal form
- relational data model
- aggregate functions
- relational databases
- complex objects
- functional dependencies
- type checking
- database technology
- transitive closure
- first order logic
- recursive queries
- incomplete information
- sql queries
- query evaluation
- object oriented
- database design
- high level