创建两个表插入数据
CREATE DATABASE beifen;
use beifen;
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);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
1、建立一个utf8编码的数据库test1
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)
3、删除 goods 表中的 goods_desc 字段及货号字段,并增加 click_count 字段
1、删除goods中的goods_desc和货号字段
mysql> alter table goods drop goods_desc;
Query OK, 0 rows affected (0.01 sec)
Records: 0 Duplicates: 0 Warnings: 0
2、增加click_count字段
mysql> alter table goods add click_count int not null;
Query OK, 0 rows affected (0.01 sec)
Records: 0 Duplicates: 0 Warnings: 04、在 goods_name 列上加唯一性索引（用alter table方式）
alter table命令增加唯一索引
mysql> alter table goods add unique index goodsname (goods_name);
Query OK, 0 rows affected (0.01 sec)
Records: 0 Duplicates: 0 Warnings: 0
5、在 shop_price 列上加普通索引（用create index方式）
mysql> create index shopprice on goods(shop_price);
Query OK, 0 rows affected (0.01 sec)
Records: 0 Duplicates: 0 Warnings: 0
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）
1、先创建普通索引
mysql> create index clickcount on goods(click_count);
Query OK, 0 rows affected (0.00 sec)
Records: 0 Duplicates: 0 Warnings: 0
2、其次查看表的索引状态
Table: goods
Non_unique: 1
Key_name: clickcount
Seq_in_index: 1
Column_name: click_count
Collation: A
Cardinality: 0
Sub_part: NULL
Packed: NULL
Null:
Index_type: BTREE
Comment:
Index_comment:
3 rows in set (0.00 sec)
3、成功添加以后，删除索引
①mysql> alter table goods drop index clickcount;
Query OK, 0 rows affected (0.00 sec)
Records: 0 Duplicates: 0 Warnings: 0
②mysql> drop index clickcount on goods;
Query OK, 0 rows affected (0.01 sec)
Records: 0 Duplicates: 0 Warnings: 0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
1、创建一视图 stu_info,查询全体学生的姓名，性别，课程名，成绩。
mysql> create view stu_info as select student.sname,student.ssex,course.cno,sc.score from student,sc,course where student.sno=sc.sno and sc.cno==course.cno;
Query OK, 0 rows affected (0.00 sec)
2、删除视图 stu_info。
mysql> drop view stu_info;
Query OK, 0 rows affected (0.00 sec)
mysql> desc stu_info;
ERROR 1146 (42S02): Table 'Student.stu_info' doesn't exist
