How are super- and subtype relationships in ER diagrams represented as tables?
ER Notation There are several ER notations. I’m not familiar with the one you are using, but it’s clear enough you are trying to represent a subtype (aka. inheritance, category, subclass, generalization hierarchy…). This is the relational cousin of the OOP inheritance. When doing subtyping, you are generally concerned with the following design decisions: Abstract … Read more