A strong entity can be defined solely by its own attributes, while a weak entity cannot. A related term is instance, in which the specific person or car would be an instance of the entity set.Įntity categories: Entities are categorized as strong, weak or associative. Other examples: Customers who purchased last month, cars currently registered in Florida. Other examples: customers, cars or products.Įntity set: Same as an entity type, but defined at a particular point in time, such as students enrolled in a class on the first day.
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A relational database has an equivalent relational table and can potentially be expressed that way as needed. It’s also later used to model a particular database or databases.
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In a broader sense, the depiction of the interconnectedness of things dates back to least ancient Greece, with the works of Aristotle, Socrates and Plato. While serving as an assistant professor at MIT’s Sloan School of Management, he published a seminal paper in 1976 titled “The Entity-Relationship Model: Toward a Unified View of Data.”
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Peter Pin-Shan Chen), currently a faculty member at Carnegie-Mellon University in Pittsburgh, is credited with developing ER modeling for database design in the 1970s.