Mysql第八次作业

simply_happy2024-07-16 21:08

一、备份与恢复作业：

创库,建表：

复制代码 
 CREATE DATABASE booksDB;
    use booksDB;

    CREATE TABLE books
    (
    bk_id  INT NOT NULL PRIMARY KEY,
    bk_title VARCHAR(50) NOT NULL,
    copyright YEAR NOT NULL
    );

    CREATE TABLE authors
    (
    auth_id     INT NOT NULL PRIMARY KEY,
    auth_name  VARCHAR(20),
    auth_gender CHAR(1)
    );

    CREATE TABLE authorbook
    (
    auth_id  INT NOT NULL,
    bk_id   INT NOT NULL
    );

插入数据：

复制代码 
 INSERT INTO books
        VALUES (11078, 'Learning MySQL', 2010),
        (11033, 'Study Html', 2011),
        (11035, 'How to use php', 2003),
        (11072, 'Teach youself javascript', 2005),
        (11028, 'Learing C++', 2005),
        (11069, 'MySQL professional', 2009),
        (11026, 'Guide to MySQL 5.5', 2008),
        (11041, 'Inside VC++', 2011);
    
    INSERT INTO authors  
        VALUES (1001, 'WriterX' ,'f'),
        (1002, 'WriterA' ,'f'),
        (1003, 'WriterB' ,'m'),
        (1004, 'WriterC' ,'f'),
        (1011, 'WriterD' ,'f'),
        (1012, 'WriterE' ,'m'),
        (1013, 'WriterF' ,'m'),
        (1014, 'WriterG' ,'f'),
        (1015, 'WriterH' ,'f');
    
    INSERT INTO authorbook
        VALUES (1001, 11033), (1002, 11035), (1003, 11072), (1004, 11028),
        (1011, 11078), (1012, 11026), (1012, 11041), (1014, 11069);

1、使用mysqldump命令备份数据库中的所有表

复制代码 
[root@node01 ~]# mysqldump -u root -p123456 booksDB > /root/booksDB.sql
 
[root@node01 ~]# ll
total 33560
-rw-r--r--  1 root root      3909 Jul 12 16:31 booksDB.sql

2、备份booksDB数据库中的books表

复制代码 
[root@node01 ~]# mysqldump -u root -p123456 booksDB books > /root/books.sql
mysqldump: [Warning] Using a password on the command line interface can be insecure.
 
[root@node01 ~]# ll
total 570976
-rw-r--r--  1 root root      3909 Jul 12 16:31 booksDB.sql
-rw-r--r--  1 root root      2121 Jul 12 16:44 books.sql

3、使用mysqldump备份booksDB和test数据库（test数据库自行准备）

复制代码 
[root@node01 ~]# mysqldump -u root -p123456 --database booksDB test > /root/booksDB.sql test.sql

4、使用mysql命令还原第二题导出的book表

复制代码 
[root@node1 ~]# mysql -u root -p booksDB</root/mysql/table_books.sql
Enter password: 
mysql> select * from books;
+-------+--------------------------+-----------+
| bk_id | bk_title                 | copyright |
+-------+--------------------------+-----------+
| 11026 | Guide to MySQL 5.5       |      2008 |
| 11028 | Learing C++              |      2005 |
| 11033 | Study Html               |      2011 |
| 11035 | How to use php           |      2003 |
| 11041 | Inside VC++              |      2011 |
| 11069 | MySQL professional       |      2009 |
| 11072 | Teach youself javascript |      2005 |
| 11078 | Learning MySQL           |      2010 |
+-------+--------------------------+-----------+

5、进入数据库使用source命令还原第二题导出的book表

复制代码 
mysql> drop table books;
mysql> source /root/mysql/table_books.sql
mysql> select * from books;
+-------+--------------------------+-----------+
| bk_id | bk_title                 | copyright |
+-------+--------------------------+-----------+
| 11026 | Guide to MySQL 5.5       |      2008 |
| 11028 | Learing C++              |      2005 |
| 11033 | Study Html               |      2011 |
| 11035 | How to use php           |      2003 |
| 11041 | Inside VC++              |      2011 |
| 11069 | MySQL professional       |      2009 |
| 11072 | Teach youself javascript |      2005 |
| 11078 | Learning MySQL           |      2010 |
+-------+--------------------------+-----------+

二、索引作业：

创库,建表：

复制代码 
mysql> create table goods(
    goods_id int primary key auto_increment,
    goods_name varchar(20) not null,
    cat_id int not null default 0,
    brand_id int not null default 0,
    goods_sn char(12) not null,
    shop_price float(6,2) not null default 0.00,
    goods_desc text 
    );
     
    mysql> create table category( 
    cat_id int primary key auto_increment, 
    cate_name varchar(20), 
    parent_id int default 0 );

1、删除 goods 表中的 goods_desc 字段及货号字段,并增加 click_count 字段

复制代码 
mysql> alter table goods drop column goods_desc;
mysql> alter table goods drop column goods_sn;
+-------------+-------------+------+-----+---------+----------------+
| Field       | Type        | Null | Key | Default | Extra          |
+-------------+-------------+------+-----+---------+----------------+
| goods_id    | int(11)     | NO   | PRI | NULL    | auto_increment |
| goods_name  | varchar(20) | NO   | UNI | NULL    |                |
| cat_id      | int(11)     | NO   |     | 0       |                |
| brand_id    | int(11)     | NO   |     | 0       |                |
| shop_price  | float(6,2)  | NO   |     | 0.00    |                |
+-------------+-------------+------+-----+---------+----------------+


mysql> alter table goods add click_count int;
+-------------+-------------+------+-----+---------+----------------+
| Field       | Type        | Null | Key | Default | Extra          |
+-------------+-------------+------+-----+---------+----------------+
| goods_id    | int(11)     | NO   | PRI | NULL    | auto_increment |
| goods_name  | varchar(20) | NO   |     | NULL    |                |
| cat_id      | int(11)     | NO   |     | 0       |                |
| brand_id    | int(11)     | NO   |     | 0       |                |
| goods_sn    | char(12)    | NO   |     | NULL    |                |
| shop_price  | float(6,2)  | NO   |     | 0.00    |                |
| click_count | int(11)     | YES  |     | NULL    |                |
+-------------+-------------+------+-----+---------+----------------+

2、在 goods_name 列上加唯一性索引（用alter table方式）：

复制代码 
mysql> alter table goods add unique index goods_name_index (goods_name(20));
mysql> show create table goods\G;
*************************** 1. row ***************************
       Table: goods
Create Table: CREATE TABLE `goods` (
  `goods_id` int(11) NOT NULL AUTO_INCREMENT,
  `goods_name` varchar(20) NOT NULL,
  `cat_id` int(11) NOT NULL DEFAULT '0',
  `brand_id` int(11) NOT NULL DEFAULT '0',
  `shop_price` float(6,2) NOT NULL DEFAULT '0.00',
  `click_count` int(11) DEFAULT NULL,
  PRIMARY KEY (`goods_id`),
  UNIQUE KEY `goods_name_index` (`goods_name`),
) ENGINE=MyISAM DEFAULT CHARSET=utf8mb4

2、在 shop_price 列上加普通索引（用create index方式）

复制代码 
mysql> create index g_price_index on goods(shop_price);
mysql> show create table goods\G;
*************************** 1. row ***************************
       Table: goods
Create Table: CREATE TABLE `goods` (
  `goods_id` int(11) NOT NULL AUTO_INCREMENT,
  `goods_name` varchar(20) NOT NULL,
  `cat_id` int(11) NOT NULL DEFAULT '0',
  `brand_id` int(11) NOT NULL DEFAULT '0',
  `shop_price` float(6,2) NOT NULL DEFAULT '0.00',
  `click_count` int(11) DEFAULT NULL,
  PRIMARY KEY (`goods_id`),
  UNIQUE KEY `goods_name_index` (`goods_name`),
  KEY `g_price_index` (`shop_price`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8mb4

4、在 click_count 上增加普通索引，然后再删除 （分别使用drop index和alter table删除）

复制代码 
mysql> alter table goods add index c_l_index (click_count);
mysql> show create table goods\G;
*************************** 1. row ***************************
       Table: goods
Create Table: CREATE TABLE `goods` (
  `goods_id` int(11) NOT NULL AUTO_INCREMENT,
  `goods_name` varchar(20) NOT NULL,
  `cat_id` int(11) NOT NULL DEFAULT '0',
  `brand_id` int(11) NOT NULL DEFAULT '0',
  `shop_price` float(6,2) NOT NULL DEFAULT '0.00',
  `click_count` int(11) DEFAULT NULL,
  PRIMARY KEY (`goods_id`),
  UNIQUE KEY `goods_name_index` (`goods_name`),
  KEY `g_price_index` (`shop_price`),
  KEY `c_l_index` (`click_count`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8mb4

mysql> alter table goods drop index c_l_index;
mysql> drop index c_l_index on goods;

mysql> show create table goods\G;
*************************** 1. row ***************************
       Table: goods
Create Table: CREATE TABLE `goods` (
  `goods_id` int(11) NOT NULL AUTO_INCREMENT,
  `goods_name` varchar(20) NOT NULL,
  `cat_id` int(11) NOT NULL DEFAULT '0',
  `brand_id` int(11) NOT NULL DEFAULT '0',
  `shop_price` float(6,2) NOT NULL DEFAULT '0.00',
  `click_count` int(11) DEFAULT NULL,
  PRIMARY KEY (`goods_id`),
  UNIQUE KEY `goods_name_index` (`goods_name`),
  KEY `g_price_index` (`shop_price`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8mb4
相关推荐
Raymond运维20 分钟前
MariaDB源码编译安装（二）
运维·数据库·mariadb
沢田纲吉32 分钟前
🗄️ MySQL 表操作全面指南
数据库·后端·mysql
RestCloud16 小时前
SQL Server到Hive：批处理ETL性能提升30%的实战经验
数据库·api
RestCloud16 小时前
为什么说零代码 ETL 是未来趋势？
数据库·api
ClouGence18 小时前
CloudCanal + Paimon + SelectDB 从 0 到 1 构建实时湖仓
数据库
Java水解20 小时前
Mysql查看执行计划、explain关键字详解（超详细）
后端·mysql
知其然亦知其所以然1 天前
MySQL 社招必考题：如何优化查询过程中的数据访问？
后端·mysql·面试
DemonAvenger1 天前
NoSQL与MySQL混合架构设计：从入门到实战的最佳实践
数据库·mysql·性能优化
程序新视界1 天前
如何在MySQL中创建聚集索引？
mysql
AAA修煤气灶刘哥2 天前
后端人速藏！数据库PD建模避坑指南
数据库·后端·mysql
热门推荐
01GitHub 镜像站点02UV 工具安装与国内镜像源配置指南03Claude Code 平替：OpenAI发布 Codex CLI ，GPT-5 国内直接使用04UV安装并设置国内源0546个Nano-banana 精选提示词，持续更新中06保姆级教程：手把手教你用Dify实现完美多轮对话（附Chatflow和提示词）07A股预测还能更准？开源大模型Kronos带你跑通预测+回测全流程08Spec-Kit 使用指南09智能库存管理的需求预测模型：从业务痛点到落地代码的完整实践10解决 WSL Ubuntu 中 /etc/resolv.conf 自动重置问题