Web Reference: Oracle only supports single inheritance. Therefore, a subtype can derive directly from only one supertype, not more than one. With object types in a type hierarchy, you can model an entity such as a customer, and also define different specializing subtypes of customers under the original type. Jul 23, 2025 · The main ideas of inheritance hierarchies in database management systems (DBMS) will be covered in this article, along with definitions, procedures, and in-depth examples to aid in understanding. Oracle does not support inheritance by tables - it uses TYPEs (objects) instead. The way to do something like this in Oracle would be to declare the Parent TYPE and the Child TYPE, then create a table to contain instances of PARENT - something like:
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