text: CREATE TABLE DEPT
         (DEPTNO NUMBER(2) CONSTRAINT PK_DEPT PRIMARY KEY,
  	    DNAME VARCHAR2(14) CONSTRAINT NN_DNAME NOT NULL,
  	    LOC VARCHAR2(13)  CONSTRAINT NN_LOC NOT NULL);
  	
  CREATE TABLE EMP
         (EMPNO NUMBER(4) CONSTRAINT PK_EMP PRIMARY KEY,
  	ENAME VARCHAR2(10)  CONSTRAINT NN_ENAME NOT NULL,
  	JOB VARCHAR2(9),
  	MGR NUMBER(4),
  	HIREDATE DATE,
  	SAL NUMBER(7,2),
  	COMM NUMBER(7,2),
  	DEPTNO NUMBER(2) CONSTRAINT FK_DEPTNO REFERENCES DEPT);
  	
  
  
  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');
  INSERT INTO EMP VALUES
  (7369,'SMITH','CLERK',7902,to_date('17-12-1980','dd-mm-yyyy'),800,NULL,20);
  INSERT INTO EMP VALUES
  (7499,'ALLEN','SALESMAN',7698,to_date('20-2-1981','dd-mm-yyyy'),1600,300,30);
  INSERT INTO EMP VALUES
  (7521,'WARD','SALESMAN',7698,to_date('22-2-1981','dd-mm-yyyy'),1250,500,30);
  INSERT INTO EMP VALUES
  (7566,'JONES','MANAGER',7839,to_date('2-4-1981','dd-mm-yyyy'),2975,NULL,20);
  INSERT INTO EMP VALUES
  (7654,'MARTIN','SALESMAN',7698,to_date('28-9-1981','dd-mm-yyyy'),1250,1400,30);
  INSERT INTO EMP VALUES
  (7698,'BLAKE','MANAGER',7839,to_date('1-5-1981','dd-mm-yyyy'),2850,NULL,30);
  INSERT INTO EMP VALUES
  (7782,'CLARK','MANAGER',7839,to_date('9-6-1981','dd-mm-yyyy'),2450,NULL,10);
  INSERT INTO EMP VALUES
  (7788,'SCOTT','ANALYST',7566,to_date('13-JUL-87')-85,3000,NULL,20);
  INSERT INTO EMP VALUES
  (7839,'KING','PRESIDENT',NULL,to_date('17-11-1981','dd-mm-yyyy'),5000,NULL,10);
  INSERT INTO EMP VALUES
  (7844,'TURNER','SALESMAN',7698,to_date('8-9-1981','dd-mm-yyyy'),1500,0,30);
  INSERT INTO EMP VALUES
  (7876,'ADAMS','CLERK',7788,to_date('13-JUL-87')-51,1100,NULL,20);
  INSERT INTO EMP VALUES
  (7900,'JAMES','CLERK',7698,to_date('3-12-1981','dd-mm-yyyy'),950,NULL,30);
  INSERT INTO EMP VALUES
  (7902,'FORD','ANALYST',7566,to_date('3-12-1981','dd-mm-yyyy'),3000,NULL,20);
  INSERT INTO EMP VALUES
  (7934,'MILLER','CLERK',7782,to_date('23-1-1982','dd-mm-yyyy'),1300,NULL,10);
  
  ALTER TABLE EMP ADD CONSTRAINT FK_EMP_MGR FOREIGN KEY (MGR) REFERENCES EMP(EMPNO);	
  
  CREATE TABLE BONUS
  	(
  	ENAME VARCHAR2(10)	,
  	JOB VARCHAR2(9)  ,
  	SAL NUMBER,
  	COMM NUMBER
  	) ;
  CREATE TABLE SALGRADE
        ( GRADE NUMBER,
  	LOSAL NUMBER,
  	HISAL NUMBER );
  INSERT INTO SALGRADE VALUES (1,700,1200);
  INSERT INTO SALGRADE VALUES (2,1201,1400);
  INSERT INTO SALGRADE VALUES (3,1401,2000);
  INSERT INTO SALGRADE VALUES (4,2001,3000);
  INSERT INTO SALGRADE VALUES (5,3001,9999);
  
  
  COMMIT;
  
  	
  