CREATE TABLE EMP
  (EMPNO NUMBER(4) NOT NULL,
   ENAME VARCHAR2(10),
   JOB VARCHAR2(9),
   MGR NUMBER(4),
   HIREDATE DATE,
   SAL NUMBER(7, 2),
   COMM NUMBER(7, 2),
   DEPTNO NUMBER(2)
  );

INSERT INTO EMP VALUES (7369, 'SMITH',  'CLERK',     7902,TO_DATE('17-DEC-1980', 'DD-MON-YYYY'),  800, NULL, 20);
INSERT INTO EMP VALUES (7499, 'ALLEN',  'SALESMAN',  7698,TO_DATE('20-FEB-1981', 'DD-MON-YYYY'), 1600,  300, 30);
INSERT INTO EMP VALUES (7521, 'WARD',   'SALESMAN',  7698,TO_DATE('22-FEB-1981', 'DD-MON-YYYY'), 1250,  500, 30);
INSERT INTO EMP VALUES (7566, 'JONES',  'MANAGER',   7839,TO_DATE('02-APR-1981', 'DD-MON-YYYY'), 2975, NULL, 20);
INSERT INTO EMP VALUES (7654, 'MARTIN', 'SALESMAN',  7698,TO_DATE('28-SEP-1981', 'DD-MON-YYYY'), 1250, 1400, 30);
INSERT INTO EMP VALUES (7698, 'BLAKE',  'MANAGER',   7839,TO_DATE('01-MAY-1981', 'DD-MON-YYYY'), 2850, NULL, 30);
INSERT INTO EMP VALUES (7782, 'CLARK',  'MANAGER',   7839,TO_DATE('09-JUN-1981', 'DD-MON-YYYY'), 2450, NULL, 10);
INSERT INTO EMP VALUES (7788, 'SCOTT',  'ANALYST',   7566,TO_DATE('09-DEC-1982', 'DD-MON-YYYY'), 3000, NULL, 20);
INSERT INTO EMP VALUES (7839, 'KING',   'PRESIDENT', NULL,TO_DATE('17-NOV-1981', 'DD-MON-YYYY'), 5000, NULL, 10);
INSERT INTO EMP VALUES (7844, 'TURNER', 'SALESMAN',  7698,TO_DATE('08-SEP-1981', 'DD-MON-YYYY'), 1500,    0, 30);
INSERT INTO EMP VALUES (7876, 'ADAMS',  'CLERK',     7788,TO_DATE('12-JAN-1983', 'DD-MON-YYYY'), 1100, NULL, 20);
INSERT INTO EMP VALUES (7900, 'JAMES',  'CLERK',     7698,TO_DATE('03-DEC-1981', 'DD-MON-YYYY'),  950, NULL, 30);
INSERT INTO EMP VALUES (7902, 'FORD',   'ANALYST',   7566,TO_DATE('03-DEC-1981', 'DD-MON-YYYY'), 3000, NULL, 20);
INSERT INTO EMP VALUES (7934, 'MILLER', 'CLERK',     7782,TO_DATE('23-JAN-1982', 'DD-MON-YYYY'), 1300, NULL, 10);

CREATE TABLE DEPT
  (DEPTNO NUMBER(2),
   DNAME VARCHAR2(14),
   LOC VARCHAR2(13)
  );

INSERT INTO DEPT VALUES (10, 'ACCOUNTING', 'NEW YORK');
INSERT INTO DEPT VALUES (20, 'RESEARCH',   'DALLAS');
INSERT INTO DEPT VALUES (30, 'SALES',      'CHICAGO');
INSERT INTO DEPT VALUES (40, 'OPERATIONS', 'BOSTON');

alter table EMP  add constraint emp_pk      primary key(empno);
alter table DEPT add constraint dept_pk     primary key(deptno);
alter table EMP  add constraint emp_fk_dept foreign key(deptno) references dept;
alter table EMP  add constraint emp_fk_emp  foreign key(mgr) references emp;
