说明： 有时候我们需要通用的实验数据，emp表 与 dept表 但是数据库中有没有。 这时，我们可以手动创建。

-- 创建表与数据
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('2-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('1-MAY-1981', 'DD-MON-YYYY'), 2850, NULL, 30);
INSERT INTO EMP VALUES (7782, 'CLARK', 'MANAGER', 7839,
TO_DATE('9-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('8-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('3-DEC-1981', 'DD-MON-YYYY'), 950, NULL, 30);
INSERT INTO EMP VALUES (7902, 'FORD', 'ANALYST', 7566,
TO_DATE('3-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 ');

-- 添加约束
alter table emp add constraint emp_pk primary key(empno);
alter table dept add constraint dept_pk primary key(deptno);
alter table dept add constraint emp_fk_dept foreign key(deptno) references dept;
alter table emp add constraint emp_fk_emp foreign key(mgr) references emp;

-- 查看数据
(11G)EODA@testdb1> select * from emp;
EMPNO ENAME JOBMGR HIREDATESAL COMM DEPTNO
---------- ---------- --------- ---------- --------- ---------- ---------- ----------
7369 SMITH CLERK7902 17-DEC-80800 20
7499 ALLEN SALESMAN7698 20-FEB-811600 30030
7521 WARD SALESMAN7698 22-FEB-811250 50030
7566 JONES MANAGER7839 02-APR-812975 20
7654 MARTIN SALESMAN7698 28-SEP-811250 140030
7698 BLAKE MANAGER7839 01-MAY-812850 30
7782 CLARK MANAGER7839 09-JUN-812450 10
7788 SCOTT ANALYST7566 09-DEC-823000 20
7839 KING PRESIDENT 17-NOV-815000 10
7844 TURNER SALESMAN7698 08-SEP-811500 030
7876 ADAMS CLERK7788 12-JAN-831100 20
7900 JAMES CLERK7698 03-DEC-81950 30
7902 FORD ANALYST7566 03-DEC-813000 20
7934 MILLER CLERK7782 23-JAN-821300 10
14 rows selected.

(11G)EODA@testdb1> select * from dept;
DEPTNO DNAMELOC
---------- -------------- -------------
10 ACCOUNTINGNEW YORK
20 RESEARCHDALLAS
30 SALESCHICAGO
40 OPERATIONSBOSTON