I have to create an entity-relationship diagram (ERD) for an assignment. I am doing this in a particular drawing tool with the Crow’s Foot notation. There is however one thing I cannot figure out:
- How would you present an “is a” hierarchy in Crow’s Foot notation?
Currently, I am showing this by means of a one-to-one relationship between the
Product superentity type and its subtypes (
- Is this the correct way to go or is it wrong? (I could not find any website talking about it).