6. The method as recited in claim 1 , wherein if the product identifier is an alphanumeric character string, the logical parts include an alphabetic part and a numeric part of the alphanumeric character string.
6. The method as recited in claim 1 , wherein if the product identifier is an alphanumeric character string, the logical parts include an alphabetic part and a numeric part of the alphanumeric character string. 7. The method as recited in claim 6 , wherein the alphabetic part and the numeric part are each indexed in a field for partial strings.