MYSQL入門學習之八：數據庫及表的基本操作
相關鏈接：
MYSQL入門學習之一：基本操作
http://www.BkJia.com/database/201212/173868.html
MYSQL入門學習之二：使用正則表達式搜索
http://www.BkJia.com/database/201212/173869.html
MYSQL入門學習之三：全文本搜索
http://www.BkJia.com/database/201212/173873.html
MYSQL入門學習之四：MYSQL的數據類型
http://www.BkJia.com/database/201212/175536.html
MYSQL入門學習之五：MYSQL的字符集
http://www.BkJia.com/database/201212/175541.html
MYSQL入門學習之六：MYSQL的運算符
http://www.BkJia.com/database/201212/175862.html
MYSQL入門學習之七：MYSQL常用函數
http://www.BkJia.com/database/201212/175864.html
一、操作數據庫 www.2cto.com
1、查看數據庫
show databases [ like ''];
示例：
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| luomian |
| mydb |
| mysql |
| net80576314 |
| phpcms_uat |
| phpcmsv9 |
| phpcmsv9_new |
| rutiao |
| szwalkers |
| test |
| v9test1 |
+--------------------+
mysql> show databases like 'php%';
+-----------------+
| Database (php%) |
+-----------------+
| phpcms_uat |
| phpcmsv9 |
| phpcmsv9_new |
+-----------------+
2、創建數據庫
create database [if not exists] dbname;
示例：
mysql> create database if not exists mydb;
3、選擇需要的數據庫
use dbname
示例：
mysql> use mydb;
Database changed
4、刪除數據庫
drop database [if exists] dbname;
示例：
mysql> drop database if exists mydb;
二、操作表
1、顯示表
show tables;
示例：
mysql> show tables;
+-----------------------+
| Tables_in_test |
+-----------------------+
| newname |
| productnotes |
| test_char |
| test_inn |
| test_inn2 |
| test_priority |
| test_trans |
| test_view |
+-----------------------+
2、創建表
示例：
mysql> create table user(
-> id int(10) not null auto_increment primary key,
-> name varchar(50) default 'N/A' not null,
-> sex char(1) null
-> )engine=InnDB;
3、復制表
示例：
mysql> create table student select * from user;
mysql> create table teacher like user;
4、重命名表
mysql> rename table teacher to senior_teacher;
mysql> alter table student rename to senior_student;
5、刪除表
mysql> drop table if exists senior_teacher;
6、查看創建表語句
mysql> show create table student;
+---------+-------------------------------------
| Table | Create Table
+---------+-------------------------------------
| student | CREATE TABLE `student` (
`id` int(10) NOT NULL DEFAULT '0',
`name` varchar(50) NOT NULL DEFAULT 'N/A',
`sex` char(1) DEFAULT NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1 |
+---------+-------------------------------------
7、查看表結構
mysql> desc student;
+-------+-------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------+-------------+------+-----+---------+-------+
| id | int(10) | NO | | 0 | |
| name | varchar(50) | NO | | N/A | |
| sex | char(1) | YES | | NULL | |
+-------+-------------+------+-----+---------+-------+
8、修改表結構 www.2cto.com
mysql> alter table student add bithday date null;
mysql> alter table student modify bithday datetime;
mysql> alter table student change bithday birt datetime;
mysql> alter table student drop column bithday;
9、操作表中的數據
mysql> select * from student;
+----+------+------+---------------------+
| id | name | sex | birt |
+----+------+------+---------------------+
| 0 | jack | 1 | 2012-12-13 00:00:00 |
+----+------+------+---------------------+
mysql> insert into senior_student select * from student;
mysql> insert into student(name,sex,birt) values('jack','1',current_date());
mysql> update student set sex = 0 where name = 'jack';
mysql> delete from student where name = 'jack';
10、創建及查看索引
mysql> create index idx_student_name on student(name);
mysql> show index from student;
+---------+------------+------------------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+
| Table | Non_unique | Key_name | Seq_in_index | Column_name | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment |
+---------+------------+------------------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+
| student | 1 | idx_student_name | 1 | name | A | NULL | NULL | NULL | | BTREE | |
+---------+------------+------------------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+
