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Oracle Tutorials - What Is a Function

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(Continued from previous topic...)

What Is a Function?

A function is a named program unit. It consists of three parts:

  • Declaration Part - Defining the function name, calling parameters, return value type, local variables and local procedures. Declaration part is required.
  • Execution Part - Defining execution logic with executable statements. Execution part is required.
  • Exception Part - Defining error handling logics. Exception part is optional.

Here how a complete procedure should look like:

FUNCTION name (parameter_1, parameter_2) RETURN type AS
  -- Declaration statements
  -- Executable statements
  RETURN value;
  -- Error handling statements

(Continued on next topic...)

  1. What Is a Procedure?
  2. What Is a Function?
  3. How To Define an Anonymous Procedure without Variables?
  4. How To Define an Anonymous Procedure with Variables?
  5. How To Create a Stored Procedure?
  6. How To Execute a Stored Procedure?
  7. How To Drop a Stored Procedure?
  8. How To Pass Parameters to Procedures?
  9. How To Create a Stored Function?
  10. How To Call a Stored Function?
  11. How To Drop a Stored Function?
  12. How To Call a Stored Function with Parameters?
  13. How To Define a Sub Procedure?
  14. How To Call a Sub Procedure?
  15. How To Define a Sub Function?
  16. Can Sub Procedure/Function Be Called Recursively?
  17. What Happens If Recursive Calls Get Out of Control?
  18. What Is the Order of Defining Local Variables and Sub Procedures/Functions?
  19. What Is the Difference between Formal Parameters and Actual Parameters?
  20. What Are the Parameter Modes Supported by PL/SQL?
  21. How To Use "IN" Parameter Properly?
  22. How To Use "OUT" Parameter Properly?
  23. How To Use "IN OUT" Parameter Properly?
  24. How To Define Default Values for Formal Parameters?
  25. What Are Named Parameters?
  26. What Is the Scope of a Local Variable?

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