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An Entity Relationship (ER) Diagram is a type of flowchart that illustrates how ?entities? such as people, objects or concepts relate to each other within a system.

ER diagram basically having three components: Entities ? It is a real-world thing which can be a person, place, or even a concept. For Example: Department, Admin, Courses, Teachers, Students, Building, etc are some of the entities of a School Management System.

Go to the File menu, find Database, choose an ER diagram type and start. The ER diagram symbols library will open automatically on the left, providing a defined set of symbols commonly used in ER diagram. Drag a suitable shape for each entity or primary business concept relevant to your model.

Hospital ER Model This is an ER model of a Hospital. The entities are represented in rectangular boxes and are Patient, Tests and Doctor. The relationships between different entities are represented by a diamond shaped box.

This diagram says that there is a one-to-one relationship between a person and their fingerprints. A person is mandatory (fingerprints must be assigned to a person), but fingerprints are optional (a person may have no fingerprints assigned in the database).

An ER model is used to represent real-world objects. An Entity is a thing or object in real world that is distinguishable from surrounding environment. For example, each employee of an organization is a separate entity.