Hello! 我是做事very 小心的小新！很高兴又见到你。上期我们讲了入门《MY SQL》3的内容。这期我们来学习新的技能：数据查询。
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Navicat MySQL Data Transfer
Source Server : localhost
Source Server Version : 50725
Source Host : localhost:3306
Source Database : ch05_db
Target Server Type : MYSQL
Target Server Version : 50725
File Encoding : 65001
Date: 2019-03-15 00:08:30
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SET FOREIGN_KEY_CHECKS=0;
– Table structure for dept
DROP TABLE IF EXISTS depts;
CREATE TABLE depts (dept_id int(11) NOT NULL AUTO_INCREMENT,dept_name varchar(20) DEFAULT NULL,
PRIMARY KEY (dept_id)
) ENGINE=InnoDB AUTO_INCREMENT=5 DEFAULT CHARSET=utf8;
– Records of dept
INSERT INTO depts VALUES (‘1’, ‘技术部’);
INSERT INTO depts VALUES (‘2’, ‘行政部’);
INSERT INTO depts VALUES (‘3’, ‘财务部’);
INSERT INTO depts VALUES (‘4’, ‘运营部’);
– Table structure for emp1
DROP TABLE IF EXISTS emp1;
CREATE TABLE emp1 (emp_id int(11) NOT NULL AUTO_INCREMENT,emp_name varchar(20) NOT NULL,dept_id int(11) NOT NULL,emp_salary float(10,2) unsigned NOT NULL,
PRIMARY KEY (emp_id),
KEY fk_emp_depts (dept_id),
CONSTRAINT fk_emp1_depts FOREIGN KEY (dept_id) REFERENCES depts (dept_id)
) ENGINE=InnoDB AUTO_INCREMENT=10 DEFAULT CHARSET=utf8;
– Records of emp1
INSERT INTO emp1 VALUES (‘1’, ‘小明’, ‘4’, ‘4000.00’);
INSERT INTO emp1 VALUES (‘2’, ‘小红’, ‘2’, ‘3500.00’);
INSERT INTO emp1 VALUES (‘3’, ‘小蓝’, ‘3’, ‘4000.00’);
INSERT INTO emp1 VALUES (‘4’, ‘小黄’, ‘1’, ‘4000.00’);
INSERT INTO emp1 VALUES (‘5’, ‘小绿’, ‘2’, ‘3500.00’);
INSERT INTO emp1 VALUES (‘6’, ‘小丽’, ‘2’, ‘4000.00’);
INSERT INTO emp1 VALUES (‘7’, ‘小马’, ‘4’, ‘4000.00’);
INSERT INTO emp1 VALUES (‘8’, ‘小兰’, ‘2’, ‘3500.00’);
INSERT INTO emp1 VALUES (‘9’, ‘小思’, ‘3’, ‘4000.00’);****