variant_sub subtracts the value of the right variant from the left variant value and returns the result mixedvariant_sub mixedleft mixedright Subtracts right from left using the following rules: If Then Both expressions are of the string type Subtraction One expression is a string type and the other a character Subtraction One expression is numeric and the other is a string Subtraction. Both expressions are numeric Subtraction Either expression is NULL NULL is returned Both expressions are empty Empty string is returned See also variant_add. &reference.com.variant-arith;