Thanks for the info Hugo. I can now see where it would be useful in a couple of queries I have for some reports - where I was getting a potential division by zero, depending on the input data. I seem to remember putting a rather inelegant solution (in comparison) to handle it. Will have to revisit.
MARCUS. Why dost thou laugh? It fits not with this hour.
TITUS. Why, I have not another tear to shed;
--Titus Andronicus, William Shakespeare