1. Basic Syntax of Functions
2. Creating and Dropping Functions
3. Function Parameters (IN, OUT, IN OUT)
4. Function Overloading
5. Returning Values from Functions
6. Using Functions with SELECT Statements
7. Scalar Functions
8. Table Functions
9. Function in WHERE, HAVING, and ORDER BY Clauses
10. Ref Cursors in Functions
11. Function Performance Optimization
12. Using Functions in Triggers
13. Function Execution in Anonymous Blocks
14. Error Handling in Functions
15. Nested Functions
16. Using Functions with Cursors
17. Bulk Collect in Functions
18. Using Functions with DBMS Packages
19. Function-based Indexes
20. Recursive Functions
21. Deterministic and Non-Deterministic Functions
22. Calling Functions from Other Functions
23. Function Debugging and Logging
24. Autonomous Transactions in Functions
25. Using Functions for Data Validation
26. External Functions (External Programs)
27. Function Versioning and Deployment
28. Schema-bound Functions
29. Security Considerations for Functions
30. Using Functions with Collection Types (Associative Arrays, Varrays, etc.)
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