Hi,
Can someone kindly explain me how can i use if-else logic in the place of case statement in the below query.

SELECT deptno, empno, ename, sal,
                WHEN deptno = 10
                   THEN sal * 0.05
                WHEN deptno = 20
                   THEN sal * 0.10
             END AS new_sal
        FROM emp;

Thanks in advance!!