What is referencedColumnName used for in JPA?

Question

In JPA there is an attribute called referencedColumnName that can be set on @JoinColumn, @PrimaryKeyJoinColumn what is the idea behind this setting

Answer 1

For a JPA 2.x example usage for the general case of two tables, with a @OneToMany unidirectional join see https://en.wikibooks.org/wiki/Java_Persistence/OneToMany#Example_of_a_JPA_2.x_unidirectional_OneToMany_relationship_annotations

Screenshot from this WikiBooks JPA article: Example of a JPA 2.x unidirectional OneToMany relationship database