Nth max salary in Oracle

Question

To find out the Nth max sal in oracle i\'m using below query

SELECT DISTINCE sal 
FROM emp a 
WHERE (
       SELECT COUNT(DISTINCE sal) 
       FROM emp b 
          


        

Answer 1

select min(sal) from (select distinct(sal) from emp  order by sal desc) where rownum <=&n;

Inner query select distinct(sal) from emp order by sal desc will give the below output as given below.

SAL 5000 3000 2975 2850 2450 1600 1500 1300 1250 1100 950 800

without distinct in the above query select sal from emp order by sal desc output as given below.

SAL 5000 3000 3000 2975 2850 2450 1600 1500 1300 1250 1250 1100 950 800

outer query will give the 'N'th max sal (E.g) I have tried here for 4th Max sal and out put as given below.

MIN(SAL) 2850