User Functions

I understand that Oracle SQL allows user functions to be defined. Can anyone help me with how to get started/references on doing this.

The function that I want to define is reasonably simple, it would take two numerical values, perform a calculation or two, then return a numerical result.

I would want to be able to use the function in a normal SELECT query, something along the lines:

SELECT
   x,
   y,
   myUserFunction(x,y)
FROM aTable;

Help! Please! Received on Wed Mar 13 2002 - 04:07:40 CET