View Design Entity Relationship Diagram Lucidchart Example Download Zip Pictures. Include the primary keys of each entity. i am fine with this however i really don't get the second question In other words, er diagrams help to explain the logical structure of databases.
For the most part, people make erd to help sketch out a new layout for the.
For example, an employee may act as a supervisor for one or more employees, while an. This is an extension to the existing class diagram. The data for this erd is kept in a table in the database. Er diagram example with solutions.