一、多表联合查询

mysql第四篇:数据操作之多表查询
#创建部门
CREATE TABLE IF NOT EXISTS dept (
    did int not null auto_increment PRIMARY KEY,
    dname VARCHAR(50) not null COMMENT '部门名称'
)ENGINE=INNODB DEFAULT charset utf8;


#添加部门数据
INSERT INTO `dept` VALUES ('1', '教学部');
INSERT INTO `dept` VALUES ('2', '销售部');
INSERT INTO `dept` VALUES ('3', '市场部');
INSERT INTO `dept` VALUES ('4', '人事部');
INSERT INTO `dept` VALUES ('5', '鼓励部');

-- 创建人员
DROP TABLE IF EXISTS `person`;
CREATE TABLE `person` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(50) NOT NULL,
  `age` tinyint(4) DEFAULT '0',
  `sex` enum('','','人妖') NOT NULL DEFAULT '人妖',
  `salary` decimal(10,2) NOT NULL DEFAULT '250.00',
  `hire_date` date NOT NULL,
  `dept_id` int(11) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=13 DEFAULT CHARSET=utf8;

-- 添加人员数据

-- 教学部
INSERT INTO `person` VALUES ('1', 'alex', '28', '人妖', '53000.00', '2010-06-21', '1');
INSERT INTO `person` VALUES ('2', 'wupeiqi', '23', '', '8000.00', '2011-02-21', '1');
INSERT INTO `person` VALUES ('3', 'egon', '30', '', '6500.00', '2015-06-21', '1');
INSERT INTO `person` VALUES ('4', 'jingnvshen', '18', '', '6680.00', '2014-06-21', '1');

-- 销售部
INSERT INTO `person` VALUES ('5', '歪歪', '20', '', '3000.00', '2015-02-21', '2');
INSERT INTO `person` VALUES ('6', '星星', '20', '', '2000.00', '2018-01-30', '2');
INSERT INTO `person` VALUES ('7', '格格', '20', '', '2000.00', '2018-02-27', '2');
INSERT INTO `person` VALUES ('8', '周周', '20', '', '2000.00', '2015-06-21', '2');

-- 市场部
INSERT INTO `person` VALUES ('9', '月月', '21', '', '4000.00', '2014-07-21', '3');
INSERT INTO `person` VALUES ('10', '安琪', '22', '', '4000.00', '2015-07-15', '3');

-- 人事部
INSERT INTO `person` VALUES ('11', '周明月', '17', '', '5000.00', '2014-06-21', '4');

-- 鼓励部
INSERT INTO `person` VALUES ('12', '苍老师', '33', '', '1000000.00', '2018-02-21', null);
创建表和数据

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