Maximum formula

Hi all,

Recently i cam across this formula.

if Maximum({@color},{NAIOT_MATERIALS.MATERIAL_NAME}) = 1 then x=1 else x=2.

Where @color is defined

my question is how are you comparing(maximum) a string with an a integer because function returns a 1 or 0 and database field returns a string how is it comparing the maximum.

And this is working

..

Please explain