Update Oracle 10g Query - increase salary 12% using update query

SELECT *
  FROM (SELECT *
          FROM (SELECT *
                  FROM (SELECT s.empid employeeid,
                               s.ename employeename,
                               SUM(i.price * oi.qty) - s.salary Topprofit
                               FROM salespersons s
                               LEFT JOIN orders o ON s.empid = o.empid
                               LEFT JOIN orderitems oi ON o.orderid = oi.orderid
                               LEFT JOIN inventory i ON oi.partid = i.partid
                        GROUP BY s.empid, s.ename, s.salary)
                ORDER BY Topprofit DESC)
         WHERE ROWNUM <= 2
        ORDER BY Topprofit ASC)
 WHERE ROWNUM = 1 and Topprofit is not null;