#### Relational Algebra

**Relational Algebra** is a procedural query language first described by E.F. Codd. It uses operators to perform queries. An operator can be either unary or binary. Select, Project, Union, Set different, Cartesian product, Rename fundamental operations of relational algebra. 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.

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