ERD diagram or entity–relationship diagram is usually the result of systematic analysis to define and describe what is important to processes in an area of a business. This diagram presents a business data schema in graphical form. It is usually drawn in a graphical form as boxes (entities) that are connected by lines (relationships) which express the associations and dependencies between entities. The first example below illustrates a bookstore ER diagram.
Learn more on what and how to make an ER diagram. These hands-on examples of the diagrams are available in best quality for you to print. ER or entity–relationship diagram describes inter-related things of interest in a specific domain of knowledge. This diagram shows the relationships of entity sets stored in a database. An entity in this context is a component of data. In other words, ER diagrams illustrate the logical structure of databases. Take a look at the example of an ER diagram provided below.