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. Aug 28, 2019 · In this post, I explore how to create a hierarchy of types. Type or class hierarchies are a key concept in object-oriented programming, because of the way that subtypes inherit attributes and methods from their parent types. All the code you see below can be run in Oracle LiveSQL through this script. Explore PL/SQL Object Types with syntax, examples, and real-world use. Learn about attributes, methods, inheritance, and when to use object-oriented PL/SQL.
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