Hi, how to write select statement to get first 10 maximum salaries

Question

hi,
i need to select first 10 maximum salaries from the emp table which is having say 100 records

Answer 1

SELECT *
FROM (SELECT * FROM my_table ORDER BY salary
ry DESC)
WHERE ROWNUM < 10;your query will return 9 rows:
SQL> select * from (select * from emp order by sal desc)
  2  where rownum < 10;
     EMPNO ENAME      JOB              MGR HIREDATE         SAL       COMM     DEPTNO
      7839 KING       PRESIDENT            17-NOV-81       5000                    10
      7788 SCOTT      ANALYST         7566 19-APR-87       3000                    20
      7902 FORD       ANALYST         7566 03-DEC-81       3000                    20
      7566 JONES      MANAGER         7839 02-APR-81       2975                    20
      7698 BLAKE      MANAGER         7839 01-MAY-81       2850                    30
      7782 CLARK      MANAGER         7839 09-JUN-81       2450                    10
      7499 ALLEN      SALESMAN        7698 20-FEB-81       1600        300         30
      7844 TURNER     SALESMAN        7698 08-SEP-81       1500          0         30
      7934 MILLER     CLERK           7782 23-JAN-82       1300                    10
9 rows selected.
Now if 2 employee has same salary, both should come in the 10 maximum salary list.
try this:
[pre]
SQL> select empno, salary
  2  from (select empno, sal salary , rank() over (order by sal desc) rank from emp)
  3  where rank <= 10 ;
     EMPNO     SALARY
      7839       5000
      7788       3000
      7902       3000
      7566       2975
      7698       2850
      7782       2450
      7499       1600
      7844       1500
      7934       1300
      7521       1250
      7654       1250
11 rows selected.look at the above query, I queried for first 10, but it returned 11 rows because empno 7521 and 7654 both should rank 10.