Basic Oracle Concepts and Programming Question:

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 logic. 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;