How to find the third highest salary from deptno20,from employee table

how to find the third highest salary from deptno20,from employee table

SELECT *
FROM emp;
EMPNO
ENAME
JOB
MGR
HIREDATE
SAL
COMM
DEPTNO
7369
SMITH
CLERK
7902
12/17/1980
1000
3
20
7499
FEDERAL
SALESMAN
7654
2/20/1981
2000
4
30
7521
WARD
SALESMAN
7698
2/22/1981
3000
4
30
7566
JONES
MANAGER
7839
4/2/1981
4000
3
20
7839
MARTIN
SALESMAN
7698
9/28/1981
5421
4
30
7698
BLAKE
MANAGER
7698
5/1/1981
6222
4
30
7782
CLARK
MANAGER
7839
6/9/1981
5222
2
10
7788
SCOTT
ANALYST
7566
12/9/1982
5463
3
20
7839
KING
PRESIDENT
7902
11/17/1981
8543
2
10
7844
TURNER
SALESMAN
7698
9/8/1981
2124
4
30
7876
ADAMS
CLERK
7788
1/12/1983
2125
3
20
7900
JAMES
CLERK
7698
12/3/1981
5462
4
30
7902
FORD
ANALYST
7566
12/3/1981
2132
3
20
7934
MILLER
CLERK
7782
1/23/1982
5165
2
10
SELECT sal, deptno
FROM (SELECT   a.*,
                 DENSE_RANK () OVER (PARTITION BY deptno ORDER BY sal DESC) r
            FROM emp a
      ---- ORDER BY sal DESC
WHERE r = 3;
SAL
DEPTNO
5421
30
5165
10
2132
20
Regards ,
Friend
Message was edited by: MostWanted!!!!

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How to find the third highest salary by distinct the salary from deptno20,from employee table

how to find the third highest salary by distinct the salary from deptno20,by using employee table

You already asked this question, a half hour earlier:
https://forums.oracle.com/thread/2569985
and received a reply.
Do not multi-post to the forums.
These are user-to-user forums and everyone is posting because they volunteer to post and not because they get paid to post. Everyone else is paid exactly the same as you are paid to post here. When you multi-post is makes you appear as impatient and expecting instantaneous answers.
That is poor forum etiquette, approaching behavior similar to spamming the forums.
This duplicate post is locked.

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Nth Highest Salary from EMP table , need explaination

I am new to the database world and hence learning queries at the initial stages. I want to retrieve the nth highest salary from the EMP table. I was not able to find out the answer by myself , so I searched on google. The following was the answer i got :
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So how come I will get the correct answer with the abov query ? I am not able to understand the part --- WHERE &N = (SELECT COUNT (DISTINCT (b.sal)) FROM EMP B WHERE a.sal<=b.sal);
Specially the condition WHERE a.sal<=b.sal is very confusing to me. Can anyone help me please to understand the same.

user12328699 wrote:
I am new to the database world and hence learning queries at the initial stages. I want to retrieve the nth highest salary from the EMP table. I was not able to find out the answer by myself , so I searched on google. The following was the answer i got :
SELECT DISTINCT (a.sal) FROM EMP A WHERE &N = (SELECT COUNT (DISTINCT (b.sal)) FROM EMP B WHERE a.sal<=b.sal);
Enter value for n: 2
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3700
Suppose the table contains salary in the following order :
SAL
2000
3000
3700
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3700
2000
So how come I will get the correct answer with the abov query ? I am not able to understand the part --- WHERE &N = (SELECT COUNT (DISTINCT (b.sal)) FROM EMP B WHERE a.sal<=b.sal);
Specially the condition WHERE a.sal<=b.sal is very confusing to me. Can anyone help me please to understand the same.There is many better way to get the nth highest salary
But still if you want to understand the same.
Assuming the data is sorted in ascending order, then
1) a.sal=2000, so a.sal<=b.sal results in count as 3 (not equal to user input)
2) a.sal=3700, so a.sal<=b.sal results in count as 2 (equal to user input)
3) a.sal = 4000 , so a.sal<=b.sal results in count as 1 (not equal to user input)
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How to get second maximum salary from employee table(sql query)

how to get second maximum salary from employee table(sql query)

dude there is no matter of structure .........that user already said its from employee table ...............its basic table in sql and there is no need to specify the table structure
.........i think u got my point I think you are the one who didn't understand Sarma's point.
Give a man a fish and you feed him once. Teach a man how to fish and you feed him a life long.
>
and the query is
select max(sal) from emp where sal<(select max(sal)
from emp);
this will give the 2nd max salary from the emp tableBtw: You solution is bad, because it needs to scan and sort the table emp twice. And a better solution has been given already.
Message was edited by:
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How to find the third highest salary from deptno20,from employee table

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