What is an Entity-Relationship Model (ER Model)?

What does ER Model stand for?

An Entity-Relationship Model (ERM) is a theoretical and conceptual way of displaying Data Relationships in Software Program development. ERM is a Database Modeling approach that generates an abstract diagram or visible illustration of a sySTEM’s Records that can be beneficial in designing a Relational Database. These diagrams are called entity-courting diagrams, ER diagrams or ERDs.

Entity-dating patterns had been first proposed by means of Peter Pin-Shan Chen of the Massachusetts Institute of Technology (MIT) in 1976.

What Does Entity-Relationship Model Mean?

The first step in statistics gadget layout dictates that the requirements evaLuation fashions illustrate the type of inFormation or information that wishes to be amassed. The statistics modeling approach may be used to demonstrate a particular interest place’s ontology. Like the Relational Model, abstract information is transformed to a logical facts model when the design of an data system is Constructed on a Database. Likewise, this is converted to a bodily model while it is bodily designed.

The constructing Blocks of an ERD are entities, relationships and Attributes. Entities have entity sorts, that are known as times of the corresponding entities. Each entity kind can exist independently of every other; for Instance, the entity “vehicle” will have the entity sorts “car” and “Bus.” Relationship is the assets that links the entity sorts together. For example, the entity type husband is related to the entity type wife with the aid of a relationship called “is-married-to.” Attributes are houses that belong to the entity sorts as well as to the relationships.

There are some of ER diagramming gear available in the marketplace. The maximum common ones are MySQL Workbench and OpenModelSphere.