SELECT EMPNO, RPAD(SUBSTR(EMPNO,1,2),4,'') AS MASKING_EMPNO, ENAME, RPAD(SUBSTR(ENAME,1,1),5,'')
FROM EMP
WHERE LENGTH(ENAME) >= 5 AND LENGTH(ENAME)<6;
SELECT EMPNO, ENAME, SAL, TRUNC((SAL/21.5),2) AS DAY_PAY, ROUND((SAL/21.5/8),1) AS TIME_PAY
FROM EMP;