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The relational model for database management is a database model based on first-order predicate logic. Edgar F. Codd proposed it in 1969. In the relational model of a database, all data is represented in terms of tuples, grouped into relations. A database organized in terms of the relational model is called relational database.

Diagram of an example database according to the Relational model.
In the relational model, related records are linked together with a "key".
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