MySQL命令1

开始学习MySQL。

// 创建数据库
CREATE DATABASE db_name;
// 删除数据库
DROP DATABASE db_name;
// 显示数据库
SHOW DATABASES;
// 选择数据库
USE db_name;
// 显示表
SHOW TABLES;

// 创建表
CREATE TABLE customer (
  id bigint(20) unsigned NOT NULL AUTO_INCREMENT,
  name varchar(32) NOT NULL DEFAULT '0',
  PRIMARY KEY (id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

// 查看表结构
DESC customer;
SHOW CREATE TABLE customer G;
SHOW TABLE STATUS LIKE 'customer' G;

// 删除表
DROP TABLE customer;

// 修改表中某一字段数据类型
ALTER TABLE customer MODIFY COLUMN name varchar(16) NOT NULL DEFAULT '0' AFTER id;

// 修改表中某一字段名称
ALTER TABLE customer CHANGE COLUMN name nickname varchar(16) NOT NULL DEFAULT '0' AFTER id;

// 添加新字段
ALTER TABLE customer ADD COLUMN last_name varchar(16) NOT NULL DEFAULT '0' AFTER id;

// 删除某一字段
ALTER TABLE customer DROP COLUMN nickname;

// 插入数据
INSERT INTO customer(id, first_name, last_name, nickname) VALUES(10000,'Wayne', 'Bruce', 'Batman');
// 部分插入数据
INSERT INTO customer(first_name, last_name) VALUES('Logan', 'Howlett');
// 省略字段名称
INSERT INTO customer VALUES(10002, 'Banner', 'Bruce', 'Hulk');
// 省略字段名称(auto_increament)
INSERT INTO customer VALUES(NULL, 'Stark', 'Tony', 'Iron Man');

// 更新记录
UPDATE customer SET nickname = 'Wolverine' WHERE id = 10001;
// 删除记录
DELETE FROM customer WHERE nickname LIKE '%Iron%';

customer表如下:

参考资料:

How I Write SQL, Part 1: Naming Conventions