On Sat, Sep 1, 2012 at 12:07 PM, David Johnston <polobo@yahoo.com> wrote:
> These are not equivalent if some values of foo are not-null and you want the sum of all non-null values while
replacingany nulls with zero. So the decision depends on what and why you are summing.
It comes to the same result with SUM though isn't it?
ChrisA
