create table empcopy
(empno number(4), ename varchar2(10), job varchar2(9),
mgr number(4), hiredate date, sal number(7,2),
comm number(7,2), deptno number(2));
insert into empcopy values (7369, 'SMITH', 'CLERK', 7902, '17-DEC-80',800,NULL,20);
insert into empcopy values (7499, 'ALLEN', 'SALESMAN', 7698, '20-FEB-81',1600,300,30);
insert into empcopy values (7521, 'WARD', 'SALESMAN', 7698, '22-FEB-81', 1250, 500,30);
insert into empcopy values (7566, 'JONES', 'MANAGER', 7839, '02-APR-81', 2975,NULL,20);
insert into empcopy values (7654, 'MARTIN','SALESMAN', 7698,'28-SEP-81', 1250, 1400, 30);
insert into empcopy values (7698, 'BLAKE', 'MANAGER', 7839, '01-MAY-81', 2850,NULL, 30);
insert into empcopy values (7782, 'CLARK', 'MANAGER', 7839, '09-JUN-81', 2450, NULL, 10);
insert into empcopy values (7788, 'SCOTT', 'ANALYST', 7566, '19-APR-87', 3000, NULL, 20);
insert into empcopy values (7839, 'KING', 'PRESIDENT', NULL, '17-NOV-81', 5000, NULL, 10);
insert into empcopy values (7844,'TURNER','SALESMAN',7698, '08-SEP-81', 1500,0,30);
insert into empcopy values (7876, 'ADAMS','CLERK', 7788, '23-MAY-87',1100, NULL, 20);
insert into empcopy values (7900, 'JAMES', 'CLERK', 7698, '03-DEC-81', 950, NULL, 30);
insert into empcopy values (7902, 'FORD', 'ANALYST', 7566, '03-DEC-81', 3000,NULL,20);
insert into empcopy values (7934, 'MILLER', 'CLERK', 7782, '23-JAN-82', 1300, NULL, 10);
select * from empcopy;