Select first n columns

Hi
I need to select first n columns thru a query. i dont know the column names.
Thanks and Regards
Ananth Antony

desc emp
EMPNO
ENAME
JOB
MGR
HIREDATE
SAL
COMM
DEPTNO
if n=3 means the output should be (i dont know the column name)
EMPNO ENAME JOB
7369 SMITH CLERK
7499 ALLEN SALESMAN
7521 WARD SALESMAN
7566 JONES MANAGER
7654 MARTIN SALESMAN
7698 BLAKE MANAGER
7782 CLARK MANAGER
7788 SCOTT ANALYST
7839 KING PRESIDENT
7844 TURNER SALESMAN
7876 ADAMS CLERK
EMPNO ENAME JOB
7900 JAMES CLERK
7902 FORD ANALYST
7934 MILLER CLERK
for emp Table.
Thanks
Ananth Antony

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