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Logical representation of an organization's data is called entity relationship model. An entity-relationship mode describes how several topics of interest relate to one another in a particular field of knowledge.
An entity-relationship model (or ER model) describes how several topics of interest relate to one another in a particular field of knowledge. Entity types (which categorize the objects of interest) and relationships between entities are the core building blocks of an ER model (instances of those entity types).
An ER model is frequently created in software engineering to represent the information that a business needs to remember in order to carry out business activities. As a result, the entity-relationship model is transformed into an abstract data model that specifies a data or information structure that can be used in a database, often a relational database.
Although there have been earlier iterations of the concept, entity-relationship modeling was created for database and design by Peter Chen and published in a 1976 paper[1]. Today, it is frequently used to educate students the fundamentals of database construction.
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