在MySQL中创建dept，emp，salgrade三张表，以供学习使用

一行行的执行下去即可。

-----------创建表

CREATE TABLE dept(
deptno INT(2) NOT NULL,
dname VARCHAR(14),
loc VARCHAR(13),
CONSTRAINT pk_dept PRIMARY KEY(deptno)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

CREATE TABLE emp (
empno int(4) NOT NULL PRIMARY KEY,
ename VARCHAR(10),
job VARCHAR(9),
mgr int(4),
hiredate DATE,
sal float(7,2),
comm float(7,2),
deptno int(2),
CONSTRAINT fk_deptno FOREIGN KEY(deptno) REFERENCES dept(deptno)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

CREATE TABLE bonus(
ename VARCHAR(10),
job VARCHAR(9),
sal INT,
comm INT
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

CREATE TABLE salgrade (
grade int,
losal int,
hisal int
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

-----------插入数据

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,'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,'1981-11-07',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);

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);