Query to find the nth highest salary...

Hi guys,.

I can't understand this query that we got a Web site. It is used to find the nth highest salary of the employee... Can someone explain to me please each and every part of it...

The Charly is:

Select distinct (a.salary)
EMP a
where 1 = (select count (distinct (salary))
b emp
where a.salary < = b.salary)

The "BOLD" part which is the return value... is my main question about this query...

Help, please

It is called a correlated sub query. The inner query is executed for each iteration of the outer query. For example, if the table emp has 14 rows and then for each salary 14 the inner query will run.
The part

select count(distinct(sal))
from emp b
where a.sal<=b.sal

actually counts the number of treatments that are less than or equal to the treatment of the outer query.
Clearly for the King, who gets the highest salary is greater than or equal to 1 (himself). It returns the highest salary.

SQL> select *
  2  from emp a
  3  where 1 >= (select count(distinct(sal))
  4  from emp b
  5  where a.sal<=b.sal)
  6  order by sal desc;

     EMPNO ENAME                               JOB              MGR HIREDATE         SAL       COMM     DEPTNO
---------- ----------------------------------- --------- ---------- --------- ---------- ---------- ----------
      7839 KING                                PRESIDENT            17-NOV-81       5000                    10

Salary of the first two.

SQL> ed
Wrote file afiedt.buf

  1  select *
  2  from emp a
  3  where 2 >= (select count(distinct(sal))
  4  from emp b
  5  where a.sal<=b.sal)
  6* order by sal desc
SQL> /

     EMPNO ENAME                               JOB              MGR HIREDATE         SAL       COMM     DEPTNO
---------- ----------------------------------- --------- ---------- --------- ---------- ---------- ----------
      7839 KING                                PRESIDENT            17-NOV-81       5000                    10
      7902 FORD                                ANALYST         7566 03-DEC-81       3000                    20
      7788 SCOTT                               ANALYST         7566 09-DEC-82       3000                    20

Tags: Database

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