An Automatic Correction Tool for Relational Algebra Queries.
Josep SolerImma BoadaFerran PradosJordi PochRamón FabregatPublished in: ICCSA (2) (2007)
Keyphrases
- relational algebra
- query language
- relational calculus
- database query languages
- probabilistic databases
- relational database systems
- expressive power
- nested relational
- data model
- relational data model
- relational operators
- relational model
- duplicate elimination
- recursive queries
- normal form
- join operator
- aggregate functions
- sparql queries
- complex objects
- null values
- first order logic
- query evaluation
- algebraic operations
- summary tables
- database
- conceptual model
- transitive closure
- type checking
- management system
- incomplete information
- universal quantification