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 booksVALUES (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 authorbookVALUES (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: 02、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: 0

    4、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: 02、其次查看表的索引状态Table: goodsNon_unique: 1Key_name: clickcountSeq_in_index: 1Column_name: click_countCollation: ACardinality: 0Sub_part: NULLPacked: NULLNull: 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: 0②mysql> 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