slovodefinícia
relational algebra
(foldoc)		relational algebra

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.

(1997-02-17)
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