This Chen ERD in PowerPoint tutorial shows you how to create Entity Relationship Diagrams in PowerPoint. Entities are objects or concepts that represent critical data. Customers, supervisors, locations, and promotions are examples of nouns. They always have one or more characteristics that distinguish each occurrence of the entity. For instance, Weak student entities are dependent on another entity type. They lack unique attributes (also known as a primary key) and have no meaning in the diagram unless they depend on another entity. The purpose of developing an entity-relationship model is to visually show the structure of a business database, where data equates to entities linked by defined relationships expressing dependencies and requirements.
