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What are the types of mapping class inheritance in Hibernate?
There are three different approaches to representing an inheritance hierarchy:
  * Table per concrete class: Discard polymorphism and Inheritance relationships completely from the relational model.
  * Table per class hierarchy: Enable polymorphism by denormalizing the relational model and using a type discriminator column to hold type information.
  * Table per sublcass: Represent "is a" (Inheritance) relationships as "has a" (foreign key) relationships.