The technique where redundant data is added to a database that’s already normalized is called denormalization. These entities stay in boxes, and arrows symbolize relationships. It is a logical entity representation and defines relationships among entities. Such models also become tables in the database that can be retrieved and then processed on the basis of the company’s needs.ĮRD is the short form of Entity Relationship Diagram. The information schema that helps in the sorting and normalization of different components of information and establishes relations among them is called a data model.
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