What Is a Function

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What Is a Function

Q

What Is a Function? - Oracle DBA FAQ - Understanding PL/SQL Language Basics

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A

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
BEGIN
  -- Executable statements
  RETURN value;
EXCEPTION
  -- Error handling statements
END;

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