Function: Abs()
Purpose: The Abs() function returns the absolute value of any numeric expression provided to it as an argument.
Usage: Abs(expression)
Returns: Absolute value (unsigned magnitude) of expression
Examples and Special Cases
Abs(-10) = 10
Abs(10) = 10
Abs(0) = 0
Abs(NULL) = NULL
Abs(uninitialized variable) = 0
