MAX
The MAX function returns the largest number in a set of values. Node references are also accepted as arguments.
Syntax
max (value1,[value2]....)Arguments
value1 - The numbers or names, arrays, or references that contain numbers. This is a required argument.
value2... - The numbers or names, arrays, or references that contain numbers. This is an optional argument.
Example
max (COLUMN1,COLUMN2,COLUMN3)Returns the maximum of COLUMN1, COLUMN2 and COLUMN3