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mysql>CREATE TABLE books

->(

->bk_id INT NOT NULL PRIMARY KEY,

->bk_title VARCHAR(50) NOT NULL,

->copyright YEAR NOT NULL

->);

mysql>CREATE TABLE authors

->(

->auth_id INT NOT NULL PRIMARY KEY,

->auth_name VARCHAR(20),

->auth_gender CHAR(1)

->);

mysql>CREATE TABLE authorbook

->(

->auth_id INT NOT NULL,

->bk_id INT NOT NULL

->);

mysql>

mysql> -- 插入数据：

mysql> 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);

Query OK, 8 rows affected (0.00 sec)

Records: 8 Duplicates: 0 Warnings: 0

mysql>

mysql> 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');

Query OK, 9 rows affected (0.00 sec)

Records: 9 Duplicates: 0 Warnings: 0

mysql>

mysql> INSERT INTO authorbook

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

Query OK, 8 rows affected (0.00 sec)

Records: 8 Duplicates: 0 Warnings: 0

1：

C:\Windows\System32>cd C:\Program Files\MySQL\MySQL Server 8.0\bin

C:\Program Files\MySQL\MySQL Server 8.0\bin>mysqldump -uroot -p123456 booksDB authorbook authors books> d:\booksDB_all_tables.sql

mysqldump: [Warning] Using a password on the command line interface can be insecure.

C:\Program Files\MySQL\MySQL Server 8.0\bin>

2：

C:\Program Files\MySQL\MySQL Server 8.0\bin>mysqldump -uroot -p123456 booksDB books> d:\booksDB_books_table.sql

mysqldump: [Warning] Using a password on the command line interface can be insecure.

3：

C:\Program Files\MySQL\MySQL Server 8.0\bin>mysqldump -uroot -p123456 booksDB test> d:\booksDB_and_test.sql

mysqldump: [Warning] Using a password on the command line interface can be insecure.

4:

C:\Program Files\MySQL\MySQL Server 8.0\bin>mysql -uroot -p123456 booksDB<d:\booksDB_books_tables.sql

5:

mysql> source d://booksDB_all_tables.sql;

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.01 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.01 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 8 rows affected (0.00 sec)

Records: 8 Duplicates: 0 Warnings: 0

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.01 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 8 rows affected (0.00 sec)

Records: 8 Duplicates: 0 Warnings: 0

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

二：索引

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

-> );

Query OK, 0 rows affected, 1 warning (0.01 sec)

mysql>

mysql> create table category(

-> cat_id int primary key auto_increment,

-> cate_name varchar(20),

-> parent_id int default 0 );

Query OK, 0 rows affected (0.01 sec)

1:

mysql> alter table goods drop column goods_desc;

Query OK, 0 rows affected (0.01 sec)

Records: 0 Duplicates: 0 Warnings: 0

mysql> alter table goods drop column goods_sn;

Query OK, 0 rows affected (0.01 sec)

Records: 0 Duplicates: 0 Warnings: 0

mysql> alter table goods add column click_count int default 0;

Query OK, 0 rows affected (0.01 sec)

Records: 0 Duplicates: 0 Warnings: 0

mysql> desc goods;

±------------±------------±-----±----±--------±---------------+

| Field | Type | Null | Key | Default | Extra |

±------------±------------±-----±----±--------±---------------+

| goods_id | int | NO | PRI | NULL | auto_increment |

| goods_name | varchar(20) | NO | | NULL | |

| cat_id | int | NO | | 0 | |

| brand_id | int | NO | | 0 | |

| shop_price | float(6,2) | NO | | 0.00 | |

| click_count | int | YES | | 0 | |

±------------±------------±-----±----±--------±---------------+

6 rows in set (0.00 sec)

mysql> desc category

-> ;

±----------±------------±-----±----±--------±---------------+

| Field | Type | Null | Key | Default | Extra |

±----------±------------±-----±----±--------±---------------+

| cat_id | int | NO | PRI | NULL | auto_increment |

| cate_name | varchar(20) | YES | | NULL | |

| parent_id | int | YES | | 0 | |

±----------±------------±-----±----±--------±---------------+

3 rows in set (0.00 sec)

2:

mysql> alter table goods add unique index index_goods_name(goods_name);

Query OK, 0 rows affected (0.01 sec)

Records: 0 Duplicates: 0 Warnings: 0

mysql> show index from goods \G;

*************************** 1. row ***************************

Table: goods

Non_unique: 0

Key_name: PRIMARY

Seq_in_index: 1

Column_name: goods_id

Collation: A

Cardinality: 0

Sub_part: NULL

Packed: NULL

Null:

Index_type: BTREE

Comment:

Index_comment:

Visible: YES

Expression: NULL

*************************** 2. row ***************************

Table: goods

Non_unique: 0

Key_name: index_goods_name

Seq_in_index: 1

Column_name: goods_name

Collation: A

Cardinality: 0

Sub_part: NULL

Packed: NULL

Null:

Index_type: BTREE

Comment:

Index_comment:

Visible: YES

Expression: NULL

2 rows in set (0.01 sec)

3:

mysql> create index index_shop_price on goods(shop_price);

Query OK, 0 rows affected (0.01 sec)

Records: 0 Duplicates: 0 Warnings: 0

mysql> show index from goods \G;

*************************** 1. row ***************************

Table: goods

Non_unique: 0

Key_name: PRIMARY

Seq_in_index: 1

Column_name: goods_id

Collation: A

Cardinality: 0

Sub_part: NULL

Packed: NULL

Null:

Index_type: BTREE

Comment:

Index_comment:

Visible: YES

Expression: NULL

*************************** 2. row ***************************

Table: goods

Non_unique: 0

Key_name: index_goods_name

Seq_in_index: 1

Column_name: goods_name

Collation: A

Cardinality: 0

Sub_part: NULL

Packed: NULL

Null:

Index_type: BTREE

Comment:

Index_comment:

Visible: YES

Expression: NULL

*************************** 3. row ***************************

Table: goods

Non_unique: 1

Key_name: index_shop_price

Seq_in_index: 1

Column_name: shop_price

Collation: A

Cardinality: 0

Sub_part: NULL

Packed: NULL

Null:

Index_type: BTREE

Comment:

Index_comment:

Visible: YES

Expression: NULL

3 rows in set (0.00 sec)

ERROR:

No query specified

4

mysql> create index index_click_count on goods(click_count);

Query OK, 0 rows affected (0.01 sec)

Records: 0 Duplicates: 0 Warnings: 0

mysql> show index from goods \G;

*************************** 1. row ***************************

Table: goods

Non_unique: 0

Key_name: PRIMARY

Seq_in_index: 1

Column_name: goods_id

Collation: A

Cardinality: 0

Sub_part: NULL

Packed: NULL

Null:

Index_type: BTREE

Comment:

Index_comment:

Visible: YES

Expression: NULL

*************************** 2. row ***************************

Table: goods

Non_unique: 0

Key_name: index_goods_name

Seq_in_index: 1

Column_name: goods_name

Collation: A

Cardinality: 0

Sub_part: NULL

Packed: NULL

Null:

Index_type: BTREE

Comment:

Index_comment:

Visible: YES

Expression: NULL

*************************** 3. row ***************************

Table: goods

Non_unique: 1

Key_name: index_shop_price

Seq_in_index: 1

Column_name: shop_price

Collation: A

Cardinality: 0

Sub_part: NULL

Packed: NULL

Null:

Index_type: BTREE

Comment:

Index_comment:

Visible: YES

Expression: NULL

*************************** 4. row ***************************

Table: goods

Non_unique: 1

Key_name: index_click_count

Seq_in_index: 1

Column_name: click_count

Collation: A

Cardinality: 0

Sub_part: NULL

Packed: NULL

Null: YES

Index_type: BTREE

Comment:

Index_comment:

Visible: YES

Expression: NULL

4 rows in set (0.00 sec)
删除

mysql> drop index index_click_count on goods;

Query OK, 0 rows affected (0.01 sec)

Records: 0 Duplicates: 0 Warnings: 0

mysql> alter table goods drop index index_click_count;

ERROR 1091 (42000): Can't DROP 'index_click_count'; check that column/key exists

mysql> show index from goods \G;

*************************** 1. row ***************************

Table: goods

Non_unique: 0

Key_name: PRIMARY

Seq_in_index: 1

Column_name: goods_id

Collation: A

Cardinality: 0

Sub_part: NULL

Packed: NULL

Null:

Index_type: BTREE

Comment:

Index_comment:

Visible: YES

Expression: NULL

*************************** 2. row ***************************

Table: goods

Non_unique: 0

Key_name: index_goods_name

Seq_in_index: 1

Column_name: goods_name

Collation: A

Cardinality: 0

Sub_part: NULL

Packed: NULL

Null:

Index_type: BTREE

Comment:

Index_comment:

Visible: YES

Expression: NULL

*************************** 3. row ***************************

Table: goods

Non_unique: 1

Key_name: index_shop_price

Seq_in_index: 1

Column_name: shop_price

Collation: A

Cardinality: 0

Sub_part: NULL

Packed: NULL

Null:

Index_type: BTREE

Comment:

Index_comment:

Visible: YES

Expression: NULL

3 rows in set (0.00 sec)