Trick math for Query 400

[Greg Wenzloff <GWenzloff@xxxxxxxxxxx>]

I need a simple report to come out of Query but one column must not go
negative.    In the define results screen this field is defined as a simple
C = A - B but we do not want C to be negative. We would like to have a zero
instead.   A and B are both 7 digit numbers with no decimals.

Is there any trick math that would do this?

Thanks,
Greg