# relational calculus

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Related to relational calculus: Tuple relational calculus

## relational calculus

(database)An operational methodolgy, founded on predicate calculus, dealing with descripitive expressions that are
equivalent to the operations of relational algebra. Codd's reduction algorithm can convert from relational calculus to
relational algebra.

Two forms of the relational calculus exist: the tuple calculus and the domain calculus.

["An Introduction To Database Systems" (6th ed), C. J. Date, Addison Wesley].

Two forms of the relational calculus exist: the tuple calculus and the domain calculus.

["An Introduction To Database Systems" (6th ed), C. J. Date, Addison Wesley].

This article is provided by FOLDOC - Free Online Dictionary of Computing (

**foldoc.org**)## relational calculus

The rules for combining and manipulating relations; for example De Morgan's law, "the complement of a union is equal to the union of the complements."Copyright © 1981-2019 by

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