INTERVIEW QUESTIONS ORACLE SQL IN ORACLE DETAILS

Question: minvalue.sql Select the Nth lowest value from a table

Answer: select level, min('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 lowest salary:
-- select level, min(sal) from emp
-- where level=2
-- connect by prior sal < sal
-- group by level

select level, min('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 lowest salary:
-- select level, min(sal) from emp
-- where level=2
-- connect by prior sal < sal
-- group by level Source: CoolInterview.com

select max(sal)"nth min sal" from(select distinct sal from emp order by sal) where rownum<=&N; Source: CoolInterview.com

select max(sal)"nth min sal" from(select distinct sal from emp order by sal) where rownum<=&N; Source: CoolInterview.com

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

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