創(chuàng)建兩個(gè)表插入數(shù)據(jù)
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命令備份數(shù)據(jù)庫(kù)中的所有表
?
2、備份booksDB數(shù)據(jù)庫(kù)中的books表
3、使用mysqldump備份booksDB和test數(shù)據(jù)庫(kù)
4、使用mysqldump備份服務(wù)器中的所有數(shù)據(jù)庫(kù)
5、使用mysql命令還原第二題導(dǎo)出的book表
6、進(jìn)入數(shù)據(jù)庫(kù)使用source命令還原第二題導(dǎo)出的book表
1、建立一個(gè)utf8編碼的數(shù)據(jù)庫(kù)test1
2、建立商品表goods和欄目表category 按如下表結(jié)構(gòu)創(chuàng)建表:存儲(chǔ)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、刪除 goods 表中的 goods_desc 字段及貨號(hào)字段,并增加 click_count 字段?
???????
?1、刪除goods中的goods_desc和貨號(hào)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: 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,然后再刪除 (分別使用drop index和alter table刪除)?
????????
1、先創(chuàng)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、其次查看表的索引狀態(tài)
? ? 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,刪除索引
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
視圖
?? ?學(xué)生表:Student (Sno, Sname, Ssex , Sage, Sdept)
?? ?學(xué)號(hào),姓名,性別,年齡,所在系 Sno為主鍵
?? ?課程表:Course (Cno, Cname,)
?? ?課程號(hào),課程名 Cno為主鍵
?? ?學(xué)生選課表:SC (Sno, Cno, Score)
?? ?學(xué)號(hào),課程號(hào),成績(jī) Sno,Cno為主鍵
?? ?
?? ?1、創(chuàng)建一視圖 stu_info,查詢?nèi)w學(xué)生的姓名,性別,課程名,成績(jī)。
?? ?
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)
文章來(lái)源:http://www.zghlxwxcb.cn/news/detail-565406.html
? ? ?2、刪除視圖 stu_info。
???????文章來(lái)源地址http://www.zghlxwxcb.cn/news/detail-565406.html
?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
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