On Thu, Oct 22, 2015 at 9:45 PM, Rousselot, Richard A < Richard.A.Rousselot at centurylink.com> wrote:
> Doing the following math, why is it that the results are not all returning > "yes"? > > SELECT > (9.2+7.9+0+4.0+2.6+1.3), > case when (9.2+7.9+0+4.0+2.6+1.3)=25.0 then "yes" else > "no" end, > (9.2+7.8+0+3.0+1.3+1.7), > case when (9.2+7.8+0+3.0+1.3+1.7)=23.0 then "yes" else > "no" end, > (9.2+7.9+0+1.0+1.3+1.6), > case when (9.2+7.9+0+1.0+1.3+1.6)=21.0 then "yes" else > "no" end > FROM > sometable; > Try the same with integers as you'll likely see different results. Floating-point math is fraught with problems when it comes to expecting exact results at a specific precision. See: http://floating-point-gui.de/ the first example of which demonstrates the problem you are seeing. -- ----- stephan beal http://wanderinghorse.net/home/stephan/ http://gplus.to/sgbeal "Freedom is sloppy. But since tyranny's the only guaranteed byproduct of those who insist on a perfect world, freedom will have to do." -- Bigby Wolf
