A regular entity can exist apart from one or more related entities.
When there is a relationship between instances of the same entity set, it is known as a unary relationship or recursive relationship. The primary and foreign keys in this relationship are identical, yet they stand for two distinct entities that play separate responsibilities.
A simple tool to help you with development is an ER diagram. Even by default, you are not required to display every entity in the system on an ER diagram.
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