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Object-oriented programming is a programming style that focuses on the usage of objects and their interactions to create complex systems. In contrast, procedural programming is a style of programming that focuses on the use of procedures, functions, and subroutines to create instructions for the computer to follow.

The fundamental difference between PLSQL's Object-Oriented Programming and Procedural Programming styles lies in how they approach data and functionality. Object-oriented programming views data and functionality as integrated entities, encapsulated within objects that can interact with each other. In contrast, procedural programming views data and functionality as separate entities and separates them into procedures and data values.

Another difference is that PLSQL's Object-Oriented Programming style allows for the creation of classes and objects, which allows for code reusability and modularity. On the other hand, PLSQL's Procedural Programming style focuses on creating self-contained procedures that can be called multiple times throughout the program.

In summary, the key differences between PLSQL's Object-Oriented Programming and Procedural Programming styles are their approach to data and functionality, their usage of objects and procedures, and their level of modularity and reusability.