MySQL数据库，emp，dept等表

-- 部门表

CREATE TABLE DEPT(
    DEPTNO INT PRIMARY KEY,  -- 部门编号
    DNAME VARCHAR(14) ,  -- 部门名称
    LOC VARCHAR(13) -- 部门地址
    ) ; 

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');

-- 员工表

CREATE TABLE EMP
    (
    EMPNO INT  PRIMARY KEY,  -- 员工编号
    ENAME VARCHAR(10),  -- 员工名称
    JOB VARCHAR(9), -- 工作
    MGR DOUBLE, -- 直属领导编号
    HIREDATE DATE,  -- 入职时间
    SAL DOUBLE, -- 工资
    COMM DOUBLE, -- 奖金
    DEPTNO INT, -- 部门号
    FOREIGN KEY(DEPTNO) REFERENCES DEPT(DEPTNO));

SELECT * FROM emp;

  INSERT INTO EMP VALUES
(7369,'SMITH','CLERK',7902,'1980-12-17',800,NULL,20);
INSERT INTO EMP VALUES
(7499,'ALLEN','SALESMAN',7698,'1981-02-20',1600,300,30);
INSERT INTO EMP VALUES
(7521,'WARD','SALESMAN',7698,'1981-02-22',1250,500,30);
INSERT INTO EMP VALUES
(7566,'JONES','MANAGER',7839,'1981-04-02',2975,NULL,20);
INSERT INTO EMP VALUES
(7654,'MARTIN','SALESMAN',7698,'1981-09-28',1250,1400,30);
INSERT INTO EMP VALUES
(7698,'BLAKE','MANAGER',7839,'1981-05-01',2850,NULL,30);
INSERT INTO EMP VALUES
(7782,'CLARK','MANAGER',7839,'1981-06-09',2450,NULL,10);
INSERT INTO EMP VALUES
(7788,'SCOTT','ANALYST',7566,'1987-07-13',3000,NULL,20);
INSERT INTO EMP VALUES
(7839,'KING','PRESIDENT',NULL,'1981-11-17',5000,NULL,10);
INSERT INTO EMP VALUES
(7844,'TURNER','SALESMAN',7698,'1981-09-08',1500,0,30);
INSERT INTO EMP VALUES
(7876,'ADAMS','CLERK',7788,'1987-07-13',1100,NULL,20);
INSERT INTO EMP VALUES
(7900,'JAMES','CLERK',7698,'1981-12-03',950,NULL,30);
INSERT INTO EMP VALUES
(7902,'FORD','ANALYST',7566,'1981-12-03',3000,NULL,20);
INSERT INTO EMP VALUES
(7934,'MILLER','CLERK',7782,'1982-01-23',1300,NULL,10); 

-- 工资等级表

CREATE TABLE SALGRADE
      ( GRADE INT,  -- 工资等级
    LOSAL DOUBLE, -- 最低工资
    HISAL DOUBLE ); -- 最高工资
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);