DECODE / CASE Question


Hi,

Say we have a very long DECODE statement like this:

DECODE(2,-99999,0,2) + DECODE(5,-99999,0,5) + DECODE(7,-99999,0,7) -
DECODE(8,-99999,0,8) * DECODE(9,-99999,0,9) stuff

Pardon the use of real numbers, that was for testing.

Now, I want to basically say if the value of this is 0, then 0 should
be returned, otherwise the result of the math should be returned.

Can I use a case statement for this somehow? Or do I enclose it
around another DECODE? Can I use the generated column alias???

Thanks!
.