How to find second highest/lowest salary

Second Highest:
SELECT T1.EMPNO,T1.SAL,T1.RNK
FROM

(SELECT
EMPNO,SAL,
RANK() OVER(ORDER BY SAL DESC) RNK
FROM
EMP) T1

WHERE T1.RNK=2

Second Lowest:
SELECT T1.EMPNO,T1.SAL,T1.RNK
FROM

(SELECT
EMPNO,SAL,
RANK() OVER(ORDER BY SAL ASC) RNK
FROM
EMP) T1

WHERE T1.RNK=2