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what is ER model? entity-relationship model (ERM)


265 day(s) ago

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anonymous

In software engineering, an entity-relationship model (ERM) is an abstract and conceptual representation of data

An entity may be defined as a thing which is recognized as being capable of an independent existence and which can be uniquely identified.
An entity may be a physical object such as a house or a car, an event such as a house sale or a car service, or a concept such as a customer transaction or order. Although the term entity is the one most commonly used, following Chen we should really distinguish between an entity and an entity-type

A relationship captures how two or more entities are related to one another. Relationships can be thought of as verbs, linking two or more nouns. Examples: an owns relationship between a company and a computer,


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