SQL> desc test
 Name                                      Null?    Type
 ----------------------------------------- -------- ----------------------------
 ID                                                 NUMBER
 FIRST_NAME                                         VARCHAR2(20)
 ADDRESS                                            VARCHAR2(20)

load data
infile *
into table test
replace
fields terminated by ','
(id,
 first_name,
 address
)

begindata
1,Little,Croatia
2,Michel,France
3,Barbara,US of A

SQL> $sqlldr scott/tiger control=test.ctl log=test.log

SQL> select * from test;

        ID FIRST_NAME           ADDRESS
---------- -------------------- --------------------
         1 Little               Croatia
         2 Michel               France
         3 Barbara              US of A

SQL> alter table test add last_name varchar2(20);

Table altered.

SQL> desc test
 Name                                      Null?    Type
 ----------------------------------------- -------- ----------------------------
 ID                                                 NUMBER
 FIRST_NAME                                         VARCHAR2(20)
 ADDRESS                                            VARCHAR2(20)
 LAST_NAME                                          VARCHAR2(20)

load data
infile *
into table test
replace
fields terminated by ','
(id,
 first_name,
 last_name,
 address
)

begindata
1,Little,Foot,Croatia
2,Michel,Cadot,France
3,Barbara,Boehmer,US of A

SQL> $sqlldr scott/tiger control=test_newcol.ctl log=test_newcol.log

SQL> select * from test;

        ID FIRST_NAME           ADDRESS              LAST_NAME
---------- -------------------- -------------------- --------------------
         1 Little               Croatia              Foot
         2 Michel               France               Cadot
         3 Barbara              US of A              Boehmer