Computing
- Relational calculus, part of the relational model for databases that provides a declarative way to specify database queries
- Relational database, a database that has a collection of tables of data items, all of which is formally described and organized according to the relational model
- Relational classification, the procedure of performing classification in relational databases
- Relational data mining, the data mining technique for relational databases
- Relational concept, a set of mathematically defined tuples in tuple relational calculus
- Relational model, a database model based on first-order predicate logic
- Relational operator, a programming language construct or operator that tests or defines some kind of relation between two entities
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