Fragments of Bag Relational Algebra: Expressiveness and Certain Answers.
Marco ConsolePaolo GuagliardoLeonid LibkinPublished in: ICDT (2019)
Keyphrases
- relational algebra
- expressive power
- query answers
- query language
- first order logic
- relational database systems
- normal form
- relational model
- data model
- transitive closure
- data complexity
- complex objects
- relational calculus
- relational data model
- probabilistic databases
- recursive queries
- database query languages
- aggregate functions
- summary tables
- functional dependencies
- knn
- data structure
- database systems
- artificial intelligence
- data mining