Using MISSING FIELD VALUES ARE NULL for external table

Question

I want to place a null for values missing in the sub_account field. Here is my external table:
CREATE OR REPLACE DIRECTORY INCOMING_ORDERS_log_dir
AS 'c:\starpubs\starpubs\dataformats\logs\INCOMING_ORDERS\log';
CREATE OR REPLACE DIRECTORY INCOMING_ORDERS_bad_dir
AS 'c:\starpubs\starpubs\dataformats\logs\INCOMING_ORDERS\bad';
create table ext_INCOMING_ORDERS_table (
Account varchar(5),
Sub_Account varchar(1),
Override_Code varchar(1),
Nomenclature varchar(28),
chg_nbr varchar(3),
quantity integer,
U_I varchar(5),
zipcode varchar(5),
type_reject varchar(2)
organization external
type oracle_loader
default directory user_dir
access parameters
records delimited by newline
missing field values are null
badfile INCOMING_ORDERS_bad_dir:'INCOMING_ORDERS%a_%p.bad'
logfile INCOMING_ORDERS_log_dir:'INCOMING_ORDERS%a_%p.log'
fields
Account(1:5) char(5),
Sub_Account(7:7) char(1),
Override_Code(10:10) char(1),
Nomenclature(11:38) char(28),
chg_nbr(40:42) char(3),
quantity(44:48) integer external,
U_I(50:54) char(5),
zipcode(56:60) char(5),
type_reject(61:62) char(2)
location('PTCLICK.MANUAL.NOMEN.TXT','PTCLICK.ORDERS.TXT', 'EUR_RES.TXT', 'MQ.TXT', 'BPRO.TXT')
reject limit unlimited;
How can I place the MISSING FIELD VALUES ARE NULL for missing values for the sub_account?

Answer 1

made the change I received this error:
SQL> select * from ext_INCOMING_ORDERS_table;
select * from ext_INCOMING_ORDERS_table
ERROR at line 1:
ORA-29913: error in executing ODCIEXTTABLEOPEN callout
ORA-29400: data cartridge error
KUP-00554: error encountered while parsing access parameters
KUP-01005: syntax error: found "no": expecting one of: "comma, date_format,
defaultif, enclosed, ltrim, lrtrim, ldrtrim, notrim, nullif, optionally, ),
rtrim, terminated"
KUP-01007: at line 7 column 26
CREATE OR REPLACE DIRECTORY INCOMING_ORDERS_log_dir
AS 'c:\starpubs\starpubs\dataformats\logs\INCOMING_ORDERS\log';
CREATE OR REPLACE DIRECTORY INCOMING_ORDERS_bad_dir
AS 'c:\starpubs\starpubs\dataformats\logs\INCOMING_ORDERS\bad';
create table ext_INCOMING_ORDERS_table (
Account varchar(5),
Sub_Account varchar(1),
Override_Code varchar(1),
Nomenclature varchar(28),
chg_nbr varchar(3),
quantity integer,
U_I varchar(5),
zipcode varchar(5),
type_reject varchar(2)
organization external
type oracle_loader
default directory user_dir
access parameters
records delimited by newline
badfile INCOMING_ORDERS_bad_dir:'INCOMING_ORDERS%a_%p.bad'
logfile INCOMING_ORDERS_log_dir:'INCOMING_ORDERS%a_%p.log'
fields
Account(1:5) char(5),
Sub_Account(7:7) char(1) NO PRESERVE BLANKS,
Override_Code(10:10) char(1),
Nomenclature(11:38) char(28),
chg_nbr(40:42) char(3),
quantity(44:48) integer external,
U_I(50:54) char(5),
zipcode(56:60) char(5),
type_reject(61:62) char(2)
location('PTCLICK.MANUAL.NOMEN.TXT','PTCLICK.ORDERS.TXT', 'EUR_RES.TXT', 'MQ.TXT', 'BPRO.TXT')
reject limit unlimited;