Oracle SQL sample database

Question

I\'m trying to learn Oracle SQL by database Supplied by it. I found somewhere tasks to be done. Database structure is supplied by Oracle:

CREATE TABLE EMP
(EMPNO         


        

Answer 1

SELECT  SUB2.ENAME , SUB2.DNAME , S.GRADE  ,SUB2.SAL  
FROM SALGRADE S,
(SELECT E.ENAME,E.SAL,D.DNAME
    FROM EMP E, DEPT D,  
        (SELECT DEPTNO, MAX(SAL) AS "MAX"
            FROM EMP
            GROUP BY DEPTNO) SUB1  
    WHERE E.SAL=SUB1.MAX
    AND E.DEPTNO=D.DEPTNO) SUB2

WHERE SUB2.SAL BETWEEN S.LOSAL AND S.HISAL