Fragments of bag relational algebra: Expressiveness and certain answers.
Marco ConsolePaolo GuagliardoLeonid LibkinPublished in: Inf. Syst. (2022)
Keyphrases
- relational algebra
- expressive power
- query language
- query answers
- relational calculus
- relational model
- first order logic
- relational database systems
- data model
- transitive closure
- normal form
- data complexity
- complex objects
- relational data model
- relational databases
- aggregate functions
- recursive queries
- algebraic operations
- database query languages
- relational operators
- probabilistic databases
- knowledge representation
- functional dependencies
- expert systems
- data structure
- database systems
- artificial intelligence
- machine learning
- database