INTERVIEW QUESTIONS ORACLE SQL IN ORACLE DETAILS

Question: maxvalue.sql Select the Nth Highest value from a table

Answer: select level, max('col_name') from my_table where level = '&n' connect by prior ('col_name') >
'col_name')
group by level;
Example:
Given a table called emp with the following columns:
-- id number
-- name varchar2(20)
-- sal number
--
-- For the second highest salary:
-- select level, max(sal) from emp
-- where level=2
-- connect by prior sal > sal
-- group by level

select level, max('col_name') from my_table where level = '&n' connect by prior ('col_name') >
'col_name')
group by level;
Example:
Given a table called emp with the following columns:
-- id number
-- name varchar2(20)
-- sal number
--
-- For the second highest salary:
-- select level, max(sal) from emp
-- where level=2
-- connect by prior sal > sal
-- group by level Source: CoolInterview.com

For example:
SELECT max(salary)
FROM (SELECT employee_id
, salary
, dense_rank() over (order by salary desc) poradi
FROM employees)
WHERE poradi = n Source: CoolInterview.com

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