The PL/SQL term for these things is "object types". To do object-oriented programming, you use a mix of SQL and PL/SQL. You create the types themselves and the tables to hold them using SQL.
You write the bodies of the methods in PL/SQL, and you can also manipulate tables of objects and call object methods through PL/SQL. The best source of information for object-oriented programming with PL/SQL is the book Oracle Database Application Developer's Guide - Object-Relational Features. More.
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