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The Relational Model

The Relational Model. Chapter 3. Modified by Donghui Zhang. Why Study the Relational Model? . Most widely used model. IBM, Informix, Microsoft, Oracle, Sybase, etc. Older models hierarchical model, network model Recent competitor: object-oriented model ObjectStore, Versant, Ontos

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Relational Model

Relational Model. Relational Database: Definitions. Relational database : a set of relations Relation: made up of 2 parts: Instance : a table , with rows and columns. #Rows = cardinality , #fields = degree (arity).

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The Relational Model

Relational Model