HOW TO GET TOP AND BOTTOM RECORDS IN SQL STATEMENT, URGENT

Question

Hi,
I want to get the TOP 2 and BOTTOM 2 records (TOP 2 SAL , BOTTOM 2 SAL) from the following query result for each department . How do I get it using a SQL statement ? Thanks
SQL> SELECT A.DNAME, B.ENAME, B.SAL FROM DEPT A, EMP B WHERE A.DEPTNO = B.DEPTNO ORDER BY DNAME, SAL
DNAME------------ENAME--------SAL
ACCOUNTING-------KING--------5000
----------------CLARK--------2450
---------------MILLER--------1300
RESEARCH--------SCOTT--------3000
-----------------FORD--------3000
----------------JONES--------2975
----------------ADAMS--------1100
----------------SMITH---------800
SALES-----------BLAKE--------2850
----------------ALLEN--------1600
---------------TURNER--------1500
-----------------WARD--------1250
---------------MARTIN--------1250
----------------JAMES---------950
14 rows selected.

Answer 1

Search for "top-N query" in oracle doucmentation.
Example :
for top 2
SELECT * FROM
(SELECT empno FROM emp ORDER BY sal)
WHERE ROWNUM < 3;
for bottom 2
SELECT * FROM
(SELECT empno FROM emp ORDER BY sal desc)
WHERE ROWNUM < 3;