Relational model

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The relational model for database management is a database model based on first-order predicate logic, first formulated and proposed in 1969 by E.F. Codd.[1][2][3]



Its central idea was to describe a database as a collection of predicates over a finite set of predicate variables, describing constraints on the possible values and combinations of values. The content of the database at any given time is a finite (logical) model of the database, i.e. a set of relations, one per predicate variable, such that all predicates are satisfied. A request for information from the database (a database query) is also a predicate.

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