MySQL第六天作业

学习MySQL第六天,掌握数据库的备份与还原、索引以及视图

一、备份与还原

/***************************样例表***************************/
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
);
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);

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

CREATE TABLE authorbook
(
  auth_id  INT NOT NULL,
  bk_id   INT NOT NULL,
  PRIMARY KEY (auth_id, bk_id),
  FOREIGN KEY (auth_id) REFERENCES authors (auth_id),
  FOREIGN KEY (bk_id) REFERENCES books (bk_id)
);

INSERT INTO authorbook
VALUES (1001, 11033), (1002, 11035), (1003, 11072), (1004, 11028),
(1011, 11078), (1012, 11026), (1012, 11041), (1014, 11069);

/***************************样例表***************************/

1、使用mysqldump命令备份数据库中的所有表

	mysqldump -uroot -p booksDB > /backup/booksDB_1.sql

2、备份booksDB数据库中的books表

	mysqldump -uroot -p booksDB books > /backup/boooksDB_books.sql

3、使用mysqldump备份booksDB和test数据库

	mysqldump -uroot -p --databases booksDB test > /backup/DB-test.sql	

4、使用mysqldump备份服务器中的所有数据库

	mysqldump -uroot -p --all-databases > /backup/allDB.sql

5、使用mysql命令还原第二题导出的book表

	mysql -uroot -p booksDB < /backup/booksDB_books.sql

6、进入数据库使用source命令还原第二题导出的book表

	use booksDB;
	source /backup/booksDB_books.sql;

二、索引

1、建立一个utf8编码的数据库test1

	create database test1 character set utf8;

2、建立商品表goods和栏目表category
按如下表结构创建表:存储引擎engine myisam 字符集charset utf8

	mysql> desc goods;
	+------------+-------------+------+-----+---------+----------------+
	| Field      | Type        | Null | Key | Default | Extra          |
	+------------+-------------+------+-----+---------+----------------+
	| goods_id   | int(11)     | NO   | PRI | NULL    | auto_increment |
	| goods_name | varchar(20) | NO   |     |         |                |
	| cat_id     | int(11)     | NO   |     | 0       |                |
	| brand_id   | int(11)     | NO   |     | 0       |                |
	| goods_sn   | char(12)    | NO   |     |         |                |
	| shop_price | float(6,2)  | NO   |     | 0.00    |                |
	| goods_desc | text        | YES  |     | NULL    |                |
	+------------+-------------+------+-----+---------+----------------+
	7 rows in set (0.00 sec)

	
	mysql> desc category;
	+-----------+-------------+------+-----+---------+----------------+
	| Field     | Type        | Null | Key | Default | Extra          |
	+-----------+-------------+------+-----+---------+----------------+
	| cat_id    | int(11)     | NO   | PRI | NULL    | auto_increment |
	| cate_name | varchar(20) | NO   |     |         |                |
	| parent_id | int(11)     | NO   |     | 0       |                |
	+-----------+-------------+------+-----+---------+----------------+
	3 rows in set (0.00 sec)

创建语句如下

	goods:
	create table goods(
	 -> goods_id int(11) primary key  auto_increment,
		-> goods_name varchar(20) not null,
	 -> cat_id int(11) not null default 0,
	 -> brand_id int(11) not null default 0,
	  -> goods_sn char(12) not null,
	 -> shop_price float(6,2) not null default 0.00,
	  -> goods_desc text
	    -> )engine=MyISAM charset=utf8;

	category:
	create table category(
		-> cat_id int(11) primary key auto_increment,
		-> cate_name varchar(20) not null,
		-> parent_id int(11) not null default 0
		-> )engine=MyISAM charset=utf8;

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

	alter table goods 
	 -> drop column goods_desc,
	 -> drop column goods_sn,
	 -> add column click_count int(11);

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

	alter table goods add unique index index_goods_name(goods_name);

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

	create index index_shop_price on goods(shop_price);

6、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)

添加索引:create index index_click_count on goods(click_count);
drop index:drop index index_click_count on goods;
alter table:alter table goods drop index index_click_count;

三、视图

学生表:Student (Sno, Sname, Ssex , Sage, Sdept)
学号,姓名,性别,年龄,所在系 Sno为主键
课程表:Course (Cno, Cname,)
课程号,课程名 Cno为主键
学生选课表:SC (Sno, Cno, Score)
学号,课程号,成绩 Sno,Cno为主键

创建语句如下:

	学生表:
	create table Student(
	  -> Sno int(11) primary key auto_increment,
	   -> Sname varchar(20) not null,
	  -> Ssex enum('男','女') not null,
	   -> Sage int(11),
	   -> Sdept varchar(20));
	课程表:
	create table Course(
		-> Cno int(11) primary key,
	 -> Cname varchar(20));
	学生选课表:
	create table SC(
	 -> Sno int(11) not null,
		-> Cno int(11) not null,
		-> Score int(11),
	 -> primary key(Sno,Cno));

1、创建一视图 stu_info,查询全体学生的姓名,性别,课程名,成绩。

	create view stu_info as select Sname,Ssex,Cname,Score 
	from Student s,Course c,SC sc 
	where s.Sno=sc.Sno and c.Cno=sc.Cno;

2、删除视图 stu_info。

	drop view stu_info;

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