Mysql第八次作业

一、备份与恢复作业：

创库,建表：

 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：

 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

[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

[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）

[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

[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

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：

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

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）：

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）

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）

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