Column Datatype Change

Hi,
I created a table with some 10 columns earlier, now one of the column datatype needs to be changed to varchar2(2), which actually in the database it is number.
The thing the table now contains 10 records. Its not allowing me to modify the column datatype, because it has rows in it. How to change the column datatype with data in the table. Pl reply ASAP.
Thanks

See the following example.
Let's modify deptno column from number to varchar2 :
SCOTT@demo102> desc emp2
Name                                      Null?    Type
EMPNO                                              NUMBER(4)
ENAME                                              VARCHAR2(10)
JOB                                                VARCHAR2(9)
MGR                                                NUMBER(4)
HIREDATE                                           DATE
SAL                                                NUMBER(7,2)
COMM                                               NUMBER(7,2)
DEPTNO NUMBER(2)
SCOTT@demo102> select count(*) from emp2;
COUNT(*)
        14
SCOTT@demo102> alter table emp2 modify deptno varchar2(2);
alter table emp2 modify deptno varchar2(2)
ERROR at line 1:
ORA-01439: column to be modified must be empty to change datatype
SCOTT@demo102> alter table emp2[b] add deptno2 varchar2(2);
Table altered.
SCOTT@demo102> update emp2 set deptno2=deptno;
14 rows updated.
SCOTT@demo102> commit;
Commit complete.
SCOTT@demo102> alter table emp2 drop column deptno
SCOTT@demo102> /
Table altered.
SCOTT@demo102> alter table emp2 rename column deptno2 to deptno
SCOTT@demo102> /
Table altered.
SCOTT@demo102> desc emp2
Name                                      Null?    Type
EMPNO                                              NUMBER(4)
ENAME                                              VARCHAR2(10)
JOB                                                VARCHAR2(9)
MGR                                                NUMBER(4)
HIREDATE                                           DATE
SAL                                                NUMBER(7,2)
COMM                                               NUMBER(7,2)
DEPTNO VARCHAR2(2)
SCOTT@demo102>
Pl reply ASAP.Since this is saturday, and saturday is an unworked day in most of countries, and since this forum is based on volunteers, you cannot ask ASAP...
Nicolas.

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