How to calculate Nth highest/lowest salaries without using Analytical functions

Nth Highest Salary:

SELECT EMPNO,ENAME,SAL FROM EMP X WHERE &N =

(SELECT COUNT(DISTINCT SAL) FROM EMP WHERE SAL >=X.SAL);

Nth Lowest Salary:

SELECT EMPNO,ENAME,SAL FROM EMP X WHERE &N = 

(SELECT COUNT(DISTINCT SAL) FROM EMP WHERE SAL <=X.SAL);