Specifies the initial numeric value to be used for the sequence.
    This value must be in the range specified by (or defaulted to)
    the other sequence attribute clauses. Valid values are in the
    range -9223373036854775808 to 9223372036854775807.

    If omitted, the START WITH value defaults to the value of
    MINVALUE for ascending sequences and MAXVALUE for descending
    sequences.