For an assignment I have to create an ERD. I am doing this in Lucidchart using the crow's foot notation. There is however one thing I cannot figure out, how would you present a IsA hierarchy in crow's foot notation?
Currently I am showing this with a one-to-one relation between the Product entity and the sub-entity (Books, Papers etc.). Is this the correct way to go or is it wrong? I couldn't find any website talking about it.
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