1. Block structure: PL/SQL is organized into blocks, which are units of code that can be compiled, stored, and executed independently. This helps in organizing and modularizing the code for better maintainability and readability.
2. Procedural constructs: PL/SQL supports various procedural constructs like loops, conditional statements, and exception handling, which help in writing complex business logic with ease.
3. Integration with SQL: PL/SQL is tightly integrated with SQL, allowing developers to seamlessly combine the power of both languages. This enables efficient manipulation of data and simplified access to database objects.
4. Error handling: Exception handling in PL/SQL allows developers to manage errors and ensure that the application can gracefully handle unexpected situations.
5. High performance: PL/SQL is designed for performance, with features like bulk processing and native compilation that help optimize code execution.
6. Security: PL/SQL provides a secure environment for executing code, with features like definer's rights and invoker's rights that help in controlling access to sensitive data and functionality.
From what I've seen, these features make PL/SQL a powerful and versatile language for working with Oracle databases, enabling developers to create efficient, maintainable, and secure applications.