Relational algebra
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In [[computer science, relational algebra is a family of algebras with a well-founded semantics used for modelling the data stored in relational databases, and defining queries on it.
Description
The main application of relational algebra is providing a theoretical foundation for relational databases, particularly query languages for such databases, chief among which is SQL.
It was first described by Edgar F. Codd while working for IBM.
See also
- Cartesian product
- D (data language specification)
- D4 (programming language) (an implementation of D)
- Database
- Logic of relatives
- Object-role modeling
- Projection (mathematics)
- Projection (relational algebra)
- Projection (set theory)
- Query language
- Relation
- Relation (database)
- Relation algebra
- Relation composition
- Relation construction
- Relational calculus
- Relational database
- Relational model
- SQL
- Theory of relations
- Triadic relation
- Tutorial D
- Tuple relational calculus
- Well-founded semantics
External links
- Relational algebra @ Wikipedia
