The first step in entity relationship modeling is to identify the entities (files) that are present in your application using the data elements you identified during your requirements analysis. An entity is a thing or object of significance for which you need to gather and store information.
Each entity must be uniquely identifiable. This means that each instance (occurrence) of an entity must be separate and distinctly identifiable from all other instances of that entity. For example, for the entity, Horse, each individual horse (instance) must be uniquely identifiable in the data model.
Each entity can be represented in a diagram by a box containing the name of the entity. The name is in singular and shown in all uppercase letters. This tutorial includes the following entities:
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