MySQL综合练习题

一、创建表的素材

CREATE TABLE dept (
    deptno INT(2) NOT NULL COMMENT '部门编号',
    dname VARCHAR (15) COMMENT '部门名称',
    loc VARCHAR (20) COMMENT '地理位置' 
);

-- 添加主键
ALTER TABLE dept ADD PRIMARY KEY (deptno);

-- 添加数据
INSERT INTO dept (deptno,dname,loc)VALUES (10,'财务部','高新四路');
INSERT INTO dept (deptno,dname,loc)VALUES (20,'人事部','科技二路');
INSERT INTO dept (deptno,dname,loc)VALUES (30,'销售部','长安区');
INSERT INTO dept (deptno,dname,loc)VALUES (40,'运输部','雁塔区');

CREATE TABLE emp(
    empno INT(4) NOT NULL COMMENT '员工编号',
    ename VARCHAR(10) COMMENT '员工名字',
    job VARCHAR(10) COMMENT '职位',
    mgr INT(4) COMMENT '上司',
    hiredate DATE COMMENT '入职时间',
    sal INT(7) COMMENT '基本工资',
    comm INT(7) COMMENT '补贴',
    deptno INT(2) COMMENT '所属部门编号'
);

-- 添加主键
ALTER TABLE emp ADD PRIMARY KEY (empno);

-- 添加外键约束
ALTER TABLE emp ADD CONSTRAINT f_ed_key
FOREIGN KEY (deptno) 
REFERENCES dept(deptno);

INSERT INTO `emp` VALUES('7369','张倩','办事员','7902','2002-12-17','820',NULL,'20');
INSERT INTO `emp` VALUES('7499','刘博','售货员','7698','1992-02-20','1900','300','30');
INSERT INTO `emp` VALUES('7521','李兴','售货员','7698','1995-07-22','1250','500','30');
INSERT INTO `emp` VALUES('7566','李雷','人事部长','7839','1991-04-02','975',NULL,'20');
INSERT INTO `emp` VALUES('7654','刘浩','售货员','7698','1991-09-28','1250','1400','30');
INSERT INTO `emp` VALUES('7698','刘涛','销售部长','7839','1997-05-01','2850',NULL,'30');
INSERT INTO `emp` VALUES('7782','华仔','人事部长','7839','1995-06-09','2450',NULL,'10');
INSERT INTO `emp` VALUES('7788','张飞','人事专员','7566','1998-04-19','3000',NULL,'20');
INSERT INTO `emp` VALUES('7839','马晓云','董事长',NULL,'1991-11-17','5000',NULL,'10');
INSERT INTO `emp` VALUES('7844','马琪','售货员','7698','1996-09-08','1500','0','30');
INSERT INTO `emp` VALUES('7876','李涵','办事员','7788','1997-05-23','1100',NULL,'20');
INSERT INTO `emp` VALUES('7900','李小涵','销售员','7698','1993-2-13','950',NULL,'30');
INSERT INTO `emp` VALUES('7902','张三','人事组长','7566','1992-10-08','3000',NULL,'20');
INSERT INTO `emp` VALUES('7934','张三丰','人事长','7782','1997-06-23','1300',NULL,'10');