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
烟雨归来1 小时前
19c补丁后oracle属主变化，导致不能识别磁盘组
数据库·oracle
厚衣服_31 小时前
第7篇：中间件全链路监控与 SQL 性能分析实践
数据库·sql·中间件
伤不起bb1 小时前
NoSQL 之 Redis 集群
数据库·redis·nosql
迷途思凡2 小时前
各数据库字段类型统计
数据库
大数据魔法师2 小时前
MongoDB（八） - MongoDB GridFS介绍及使用Python操作GridFS
数据库·python·mongodb
wowocpp2 小时前
mybatis 关联映射---一对一关联映射
数据库·mybatis
1977835462 小时前
PostgreSQL初体验
数据库·postgresql
晚风_END2 小时前
postgresql|数据库|只读用户的创建和删除（备忘）
数据库·postgresql·oracle
Jiangnan_Cai3 小时前
docker 安装 milvus standalone 版本 + attu
数据库·docker·milvus
热门推荐
01Coze扣子平台完整体验和实践（附国内和国际版对比）02【图像处理与机器视觉】XJTU期末考点03KGG转MP3工具|非KGM文件|解密音频04零代码入门 | Coze——让大模型接入自己的数据库05从零安装 LLaMA-Factory 微调 Qwen 大模型成功及所有的坑06YOLOv8入门 | 重要性能衡量指标、训练结果评价及分析及影响mAP的因素【发论文关注的指标】07DeepSeek各版本说明与优缺点分析08海康Visionmaster-常见问题排查方法-启动阶段09【SpeedAI科研小助手】2分钟极速解决知网维普重复率、AIGC率过高，一键全文降！文件格式不变，公式都保留的！10R-tree详解