Oracle 9i SQL: Find nth highest

Hi,
Please help me to understand the logic behind the following query to find the nth highest:
select empNo, salary
from emp a
where (n-1) = (select count(*) from (select distinct salary from emp)b where b.salary > a.salary )
Thanks,
priya ranjan

Read the following marvellous link:
http://www.oracle.com/technology/oramag/oracle/06-sep/o56asktom.html
Greetings,
Simon

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select
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chris227 wrote:
Sory, may be i am blind, dont see it yet.
Doesnt the Nth high paid employee earns the Nth highest salary?
No. Multiple employees can earn same salary. Look at EMP table:
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KING             5000
FORD             3000
SCOTT            3000
JONES            2975
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CLARK            2450
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MILLER           1300
WARD             1250
MARTIN           1250
ENAME             SAL
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JAMES             950
SMITH             800
Highest salary 5000. Second highest salary is 3000. Third highest salary is 2975. Now look what NTH_VALUE returns:
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2    from (select nth_value(sal,&n) over(order by sal desc) sal from emp)
3 /
Enter value for n: 1
old   2:   from (select nth_value(sal,&n) over(order by sal desc) sal from emp)
new   2:   from (select nth_value(sal,1) over(order by sal desc) sal from emp)
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old   2:   from (select nth_value(sal,&n) over(order by sal desc) sal from emp)
new   2:   from (select nth_value(sal,2) over(order by sal desc) sal from emp)
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old   2:   from (select nth_value(sal,&n) over(order by sal desc) sal from emp)
new   2:   from (select nth_value(sal,3) over(order by sal desc) sal from emp)
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SQL> /
Enter value for n: 4
old   2:   from (select nth_value(sal,&n) over(order by sal desc) sal from emp)
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SY.

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956684 wrote:
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956684 wrote:I am newly changed the technology into oracle PL/SQL developer,In one (3-Sep-2012) you said you have 4+ years experienced in PL/SQL developer, in the other (17-Nov-2012) you said you are new to PL/SQL developer.
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If I can give you my humble opinion, learning is a slow path. You don't become expert in one day. It's a matter of learning and experiencing day by day.
One last thing. Writing message like this:
Any1 can guide me, how to debug oracle PL/SQL package, and have to fix bugs or changing the requirement by using toad, sometimes i resolve the problem, and i take backup in notepad, after sometime if i use the same notepad contents, the something changed, i dont no how to keep the "IF loop" correctly, Sometimes while editing, the loop nevigation changes, so that i am getting more confusions. I dont no how to correct the packages already written, and how to solve problems, i use anonymous for seeing output. Dont no how to identify and fix the bug or requirement changes,. I am not sure where the code need changes. How to test properly for fixing the bugs, and how to change the logic, any1 help me out from this,... kindly give me good solution.. thnak you in advanceis not nice. Your message looks confusing, a single paragraph, approximate English.
Being clean and organized in your job is shown also in your messages. If you post your message in a clear and well written (and formatted) way you will have more chances to get an answer.
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By SQL DBA, I assume you mean SQL Server DBA. SQL is 'Structure Query Language' and is not a specific product, no matter how much the Microsoft community might wish to usurp the term. <g>
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Whether true or not is irrelevant, these are direct quotes from some of my customers.
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>
1. Why are Oracle DBA's paid more than SQL DBA's? It
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>
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>
3. With that extra cash, is there typically more
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>
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>
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