mirror of https://github.com/dunwu/db-tutorial.git
92 lines
2.8 KiB
SQL
92 lines
2.8 KiB
SQL
/**
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* Mysql DML 语句示例
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* @author Zhang Peng
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* @date 2018/4/28
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*/
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#############################################################
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# 运行本例的预置操作
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#############################################################
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-- 新建数据表 user
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DROP TABLE IF EXISTS user;
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CREATE TABLE user (
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id int(10) unsigned NOT NULL AUTO_INCREMENT COMMENT 'Id',
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username varchar(64) NOT NULL DEFAULT 'default' COMMENT '用户名',
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password varchar(64) NOT NULL DEFAULT 'default' COMMENT '密码',
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email varchar(64) NOT NULL DEFAULT 'default' COMMENT '邮箱',
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PRIMARY KEY (id)
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) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='用户表';
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-- 添加测试数据
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INSERT INTO user(username, password, email) VALUES ('张三', '123456', 'xxxx@163.com');
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INSERT INTO user(username, password, email) VALUES ('李四', '123456', 'xxxx@163.com');
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INSERT INTO user(username, password, email) VALUES ('王五', '123456', 'xxxx@163.com');
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INSERT INTO user(username, password, email) VALUES ('赵六', '123456', 'xxxx@163.com');
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INSERT INTO user(username, password, email) VALUES ('柳七', '123456', 'xxxx@163.com');
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INSERT INTO user(username, password, email) VALUES ('英八', '123456', 'xxxx@163.com');
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INSERT INTO user(username, password, email) VALUES ('雷九', '123456', 'xxxx@163.com');
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#############################################################
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# 插入数据
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#############################################################
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-- 插入完整的行
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INSERT INTO user
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VALUES (10, 'root', 'root', 'xxxx@163.com');
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-- 插入行的一部分
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-- 注意自增ID数值，由于当前最大的ID值为10，所以插入本条记录时自增ID为11
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INSERT INTO user(username, password, email)
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VALUES ('admin', 'admin', 'xxxx@163.com');
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#############################################################
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# 更新数据
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#############################################################
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-- 更新记录
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UPDATE user
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SET username='robot', password='robot'
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WHERE username = 'root';
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#############################################################
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# 查询数据
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#############################################################
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-- 查询单列
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SELECT username FROM user;
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-- 查询多列
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SELECT username, password FROM user;
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-- 查询所有列
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SELECT * FROM user;
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-- 查询不同的值
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SELECT DISTINCT password FROM user;
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SELECT DISTINCT username, password FROM user;
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-- 限制结果
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-- 返回前 5 行
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SELECT * FROM user LIMIT 5;
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-- 返回前 5 行
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SELECT * FROM user LIMIT 0, 5;
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-- 返回第 3 ~ 5 行
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SELECT * FROM user LIMIT 2, 3;
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-- 简单的过滤查询
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SELECT username, password FROM user
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WHERE id = 1;
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#############################################################
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# 删除数据
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#############################################################
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-- 删除符合条件的记录
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DELETE FROM user
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WHERE username = 'robot';
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-- 清空数据表
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TRUNCATE TABLE user;
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