View Design Derived Attribute Er Diagram Example Download Zip Pictures. Er diagram stands for entity relationship diagram, also known as erd is a er diagrams are created based on three basic concepts: Er diagrams can be a visible instrument which can be helpful to represent the er design.
When you have a column where it's value could be calculated from another column.
Numberofemployees is a derived attribute of entity department. Example of a derived attribute. Every ellipse represents one attribute and is derived attributes are depicted by dashed ellipse. Er diagram stands for entity relationship diagram, also known as erd is a er diagrams are created based on three basic concepts: