I need the employees who have the highest 3 values in the salary field
, even there more then one has the same value.
Ex.

Empno Sal
----- ---
1 1000
2 500
3 1000
4 800
5 700
6 250
7 800
8 100

The result has to be like :

Empno
-----
1
3
4
5
7