Specifies the size of the increment and the direction (ascending
    or descending) of the sequence. This numeric value must be in the
    range -2147483648 through 2147483647, excluding 0. The absolute
    value must be less than the difference of MAXVALUE and MINVALUE.
    A negative value specifies a descending sequence; a positive
    value specifies an ascending sequence. By default, the numeric
    value is 1.