16+ Design Entity Relationship Model Online Example Download Zip Pics. An entity is represented as rectangle in an er diagram. A basic er model is composed of entity types (which classify the things of interest) and specifies relationships that can exist between entities (instances of those entity types).
Represented by a solid line connecting two entities with a diamond in the middle.
In the following er diagram we have two entities student. Browse the examples to spark ideas or use one as a template to get. They are denoted by rectangle with single border. It contains an er diagram which is download the app.