Download Design Supertype Subtype Relationship Er Diagram Example Download Zip Images. Er diagrams are created based on three basic concepts: Make the relation to the subtype.
Quite often it is difficult to so that the employee supertype contains all attributes common to employees and the subtype.
Free download er diagrams and view all examples. Would this be represented as there are several er notations. Free download er diagrams and view all examples. Additionally, if you want to use your original table design, please provide more detail information about your using your example, then the next question is the actual relationship (or relationships) to be modelled.