## relational algebra

<*database, theory*> A family of algebra with a well-founded
semantics used for modelling the data stored in relational
databases, and defining queries on it. The main operations
of the relational algebra are the set operations (such as
union, intersection, and cartesian product), selection
(keeping only some lines of a table) and the projection
(keeping only some columns).

The relational data model describes how the data is structured.

Codd's reduction algorithm can convert from relational calculus to relational algebra.

Last updated: 1997-02-17

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**Nearby terms:**

**relational algebra**» relational calculus » relational database » relational database management system