目录
备份:先创建如下数据库和表
1、使用mysqldump命令备份数据库中的所有表
2、备份booksDB数据库中的books表
3、使用mysqldump备份booksDB和test数据库
4、使用mysqldump备份服务器中的所有数据库
5、使用mysql命令还原第二题导出的book表
6、进入数据库使用source命令还原第二题导出的book表
索引
1、删除 goods 表中的 goods_desc 字段及货号字段,并增加 click_count 字段
2、在 goods_name 列上加唯一性索引(用alter table方式)
3,在 shop_price 列上加普通索引(用create index方式)
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)
视图
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);
mysqldump --databases booksDB -uroot -p123 > /booksDB1.sql
mysqldump booksDB books -uroot -p123 > /booksDB2.sql
mysqldump --databases booksDB --tables books -uroot -p123 > /booksDB3.sql
mysqldump --all-databases -uroot -p123 > /booksDB3.sql
mysql -uroot -p123 booksDB < /booksDB2.sql
source /booksDB2.sql
创建如下数据库
create database test1 charset utf8;
use test1
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;
create table category(
-> cat_id int(11) not null primary key auto_increment,
-> cate_name varchar(20) not null,
-> parent_id int(11) not null default(0))engine=myisam charset utf8;
alter table goods drop goods_desc;
alter table goods drop goods_id;
alter table goods add click_count int(11);
alter table goods add unique index uni_index_goods_name(goods_name);
create index shop_price_index on goods(shop_price);
创建索引:
create index click_count_index on goods(click_count);
drop 删除:
drop index click_count_index on goods;
alter删除:
alter table goods drop index click_count_index;
创建如下表:
create table student(
-> sno int(11) primary key auto_increment,
-> sname varchar(20),
-> ssex enum('m','f'),
-> sage int(11),
-> sdept varchar(20));
create table course( cno int(11) primary key, cname varchar(20));
create view info as select * from student s,course c where s.sno=c.cno;