Fields=(column-name-list)

    Specifies the column or columns of the table or view to be
    unloaded from the database. If you list multiple columns,
    separate the column names with a comma, and enclose the list
    of column names within parentheses. This qualifier also specifies
    the order in which the columns should be unloaded if that order
    differs from what is defined for the table or view. Changing the
    structure of the table or view could be useful when restructuring
    a database or when migrating data between two databases with
    different metadata definitions. The default is all the columns
    defined for the table or view in the order defined.