目录
4.7 把student1的表结构和数据保存到新表student
1. centos6.5安装mysql5版本
1.1 以su超级用户，安装Mysql数据库
[st01@master ~]$ rpm -ivh MySQL-server-5.5.48-1.linux2.6.i386.rpm --force --nodeps
1.2 启动Mysql数据库
[root@master st01]# service mysql start
1.3、安装Mysql客户端
[root@master st01]# rpm -ivh MySQL-client-5.5.48-1.linux2.6.i386.rpm --force --nodeps
1.4 进入Mysql
[root@master st01]# mysql
1.5 设置密码123456，展示所有数据库
mysql> set password for 'root'@'localhost' = password('123456');
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| test |
+--------------------+
1.6 进入数据库test
mysql> use test
Database changed
1.7 创建数据库表
mysql> create table hello(id int);
Query OK, 0 rows affected (0.02 sec)
mysql> show tables;
+----------------+
| Tables_in_test |
+----------------+
| hello |
+----------------+
1 row in set (0.00 sec)
mysql> exit
Bye
1.8 重新输入密码123456，进入数据库
[root@master hive]# mysql -u root -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 22
Server version: 5.5.48 MySQL Community Server (GPL)
Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| hive |
| mysql |
| performance_schema |
| test |
+--------------------+
2. 数据的基本操作
[stu@localhost ~]$ su
密码：
[root@localhost stu]# mysql -u root -p
Enter password: 123456
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.5.48 MySQL Community Server (GPL)
Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
2.1 查看数据库
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| test |
+--------------------+
4 rows in set (0.02 sec)
2.2 创建数据库
mysql> create database mbdb1;
Query OK, 1 row affected (0.00 sec)
删除数据库：
mysql> drop database mbdb1;
Query OK, 0 rows affected (0.03 sec)
mysql> create database mydb1;
Query OK, 1 row affected (0.01 sec)
创建一个utf8编码的数据库：
mysql> create database mydb2 character set utf8;
Query OK, 1 row affected (0.00 sec)
mysql> show create database mydb2;
+----------+----------------------------------------------------------------+
| Database | Create Database |
+----------+----------------------------------------------------------------+
| mydb2 | CREATE DATABASE `mydb2` /*!40100 DEFAULT CHARACTER SET utf8 */ |
+----------+----------------------------------------------------------------+
1 row in set (0.00 sec)
2.3 进入数据库
mysql> use mydb2;
Database changed
2.4 创建表
create table student (
id int,
name varchar(20),
chinese double,
english double,
math double);
mysql> create table student(
-> id int,
-> name varchar(20),
-> chinese double,
-> english double,
-> math double
-> );
Query OK, 0 rows affected (0.04 sec)
2.5 写入表数据
insert into student(id,name,chinese,english,math)
values(1,'张三',78.8,98,66);
insert into student(id,name,chinese,english,math)
values(2,'李四',88.5,68,96);
mysql> insert into student(id,name,chinese,english,math)
-> values(1,'张三',78.8,98,66);
Query OK, 1 row affected (0.00 sec)
mysql> insert into student(id,name,chinese,english,math)
-> values(2,'李四',88.5,68,96);
Query OK, 1 row affected (0.03 sec)
mysql> select * from student;
+------+--------+---------+---------+------+
| id | name | chinese | english | math |
+------+--------+---------+---------+------+
| 1 | 张三 | 78.8 | 98 | 66 |
| 2 | 李四 | 88.5 | 68 | 96 |
+------+--------+---------+---------+------+
2 rows in set (0.01 sec)
3. 安装MYSQL问题解决
3.1 以su超级用户，检查mysql运行状态
[root@localhost 桌面]# service mysql status
SUCCESS! MySQL running (2389)
3.2 检查mysql安装情况
[root@localhost 桌面]# rpm -qa|grep mysql
mysql-libs-5.1.73-5.el6_6.i686
3.3 卸载
[root@localhost 桌面]# rpm -e mysql-libs-5.1.73-5.el6_6.i686
3.4 检查进程，并关闭
[root@localhost 桌面]# ps -aux|grep mysql
Warning: bad syntax, perhaps a bogus '-'? See /usr/share/doc/procps-3.2.8/FAQ
root 2189 0.0 0.1 5124 1396 ? S 17:24 0:00 /bin/sh /usr/bin/mysqld_safe --datadir=/var/lib/mysql --pid-file=/var/lib/mysql/localhost.localdomain.pid
mysql 2389 0.1 3.1 332068 32420 ? Sl 17:24 0:00 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --log-error=/var/log/mysqld.log --pid-file=/var/lib/mysql/localhost.localdomain.pid --socket=/var/lib/mysql/mysql.sock
root 3066 0.0 0.0 6056 796 pts/0 S+ 17:28 0:00 grep mysql
[root@localhost 桌面]# kill -9 2389
[root@localhost 桌面]# service mysql status
SUCCESS! MySQL running (3112)
清理mysql->取消勾选->应用
rm -rf /var/lib/mysql
4. 数据库DML操作
[stu@localhost ~]$ su
密码：
[root@localhost stu]# mysql -u root -p
Enter password: 123456
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.5.48 MySQL Community Server (GPL)
Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
4.1 查看数据库
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| test |
+--------------------+
4 rows in set (0.02 sec)
4.2 创建数据库
mysql> use mydb1;
Database changed
mysql> show tables;
Empty set (0.00 sec)
create table student (
id int,
name varchar(20),
chinese double,
english double,
math double);
mysql> create table student(
-> id int,
-> name varchar(20),
-> chinese double,
-> english double,
-> math double
-> );
Query OK, 0 rows affected (0.04 sec)
insert into student(id,name,chinese,english,math)
values(1,'张三',78.8,98,66);
insert into student(id,name,chinese,english,math)
values(2,'李四',88.5,68,96);
4.3 添加表列
mysql> alter table student add age varchar(5);
Query OK, 2 rows affected (0.06 sec)
Records: 2 Duplicates: 0 Warnings: 0
mysql> select * from student;
+------+--------+---------+---------+------+------+
| id | name | chinese | english | math | age |
+------+--------+---------+---------+------+------+
| 1 | 张三 | 78.8 | 98 | 66 | NULL |
| 2 | 李四 | 88.5 | 68 | 96 | NULL |
+------+--------+---------+---------+------+------+
2 rows in set (0.00 sec)
4.4 修改列类型
把varhcar(5)改成int类型
mysql> alter table student modify age int;
Query OK, 2 rows affected (0.02 sec)
Records: 2 Duplicates: 0 Warnings: 0
4.5 修改列名
mysql> alter table student change age username varchar(20);
Query OK, 2 rows affected (0.23 sec)
Records: 2 Duplicates: 0 Warnings: 0
mysql> select * from student;
+------+--------+---------+---------+------+----------+
| id | name | chinese | english | math | username |
+------+--------+---------+---------+------+----------+
| 1 | 张三 | 78.8 | 98 | 66 | NULL |
| 2 | 李四 | 88.5 | 68 | 96 | NULL |
+------+--------+---------+---------+------+----------+
4.6 修改表名
mysql> rename table student to student1;
Query OK, 0 rows affected (0.00 sec)
mysql> select * from student1;
+------+--------+---------+---------+------+----------+
| id | name | chinese | english | math | username |
+------+--------+---------+---------+------+----------+
| 1 | 张三 | 78.8 | 98 | 66 | NULL |
| 2 | 李四 | 88.5 | 68 | 96 | NULL |
+------+--------+---------+---------+------+----------+
2 rows in set (0.00 sec)
4.7 把student1的表结构和数据保存到新表student
mysql> create table student as select * from student1;
Query OK, 2 rows affected (0.01 sec)
Records: 2 Duplicates: 0 Warnings: 0
mysql> select * from student;
+------+--------+---------+---------+------+----------+
| id | name | chinese | english | math | username |
+------+--------+---------+---------+------+----------+
| 1 | 张三 | 78.8 | 98 | 66 | NULL |
| 2 | 李四 | 88.5 | 68 | 96 | NULL |
+------+--------+---------+---------+------+----------+
2 rows in set (0.00 sec)
4.8 表结构student添加id主键
mysql> alter table student add constraint primary key(id);
Query OK, 2 rows affected (0.03 sec)
Records: 2 Duplicates: 0 Warnings: 0
4.9 表student1删除id=1的行
mysql> delete from student1 where id=1;
Query OK, 1 row affected (0.00 sec)
mysql> select * from student1;
+------+--------+---------+---------+------+----------+
| id | name | chinese | english | math | username |
+------+--------+---------+---------+------+----------+
| 2 | 李四 | 88.5 | 68 | 96 | NULL |
+------+--------+---------+---------+------+----------+
1 row in set (0.00 sec)
4.10 表student1删除全部数据
mysql> truncate table student1;
Query OK, 0 rows affected (0.01 sec)
mysql> select * from student1;
Empty set (0.00 sec)
4.11 表student1删除
mysql> drop table student1;
5. 数据库用户操作
[stu@localhost ~]$ su
密码：
[root@localhost stu]# mysql -u root -p
Enter password: 123456
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.5.48 MySQL Community Server (GPL)
Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
5.1 创建用户（@本机用户，%网络用户）
mysql> create user mysql@localhost identified by '123456';
Query OK, 0 rows affected (0.00 sec)
mysql> grant select on *.* to mysql@localhost;
Query OK, 0 rows affected (0.00 sec)
5.2 查看用户权限
mysql> show grants for mysql@localhost;
+---------------------------------------------------------------------------------------------------------------+
| Grants for mysql@localhost |
+---------------------------------------------------------------------------------------------------------------+
| GRANT SELECT ON *.* TO 'mysql'@'localhost' IDENTIFIED BY PASSWORD '*6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9' |
+---------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)
5.3 撤消用户权限
mysql> revoke select on *.* from mysql@localhost;
Query OK, 0 rows affected (0.02 sec)
5.4 修改密码
mysql> update mysql.user set password=password('234567') where user='mysql';
Query OK, 1 row affected (0.00 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
5.5 打开新终端
[root@localhost mysql]# mysql -u mysql -p
Enter password: 123456
ERROR 1045 (28000): Access denied for user 'mysql'@'localhost' (using password: YES)
[root@localhost mysql]# mysql -u mysql -p
Enter password: 234567
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 5
Server version: 5.5.48 MySQL Community Server (GPL)
Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql>
5.6 要回去用root账户删除mysql账户
mysql> drop user mysql;
6. 数据库查询操作
6.1 进入数据库
[root@localhost mysql]# mysql -u root -p
mysql> user mydb1;
mysql> select * from student where chinese<80;
+----+--------+---------+---------+------+----------+
| id | name | chinese | english | math | username |
+----+--------+---------+---------+------+----------+
| 1 | 张三 | 78.8 | 98 | 66 | NULL |
+----+--------+---------+---------+------+----------+
mysql> select * from student where chinese>80 and chinese<90;
+----+--------+---------+---------+------+----------+
| id | name | chinese | english | math | username |
+----+--------+---------+---------+------+----------+
| 2 | 李四 | 88.5 | 68 | 96 | NULL |
+----+--------+---------+---------+------+----------+
1 row in set (0.00 sec)
mysql> select * from student where chinese between 80 and 90;
+----+--------+---------+---------+------+----------+
| id | name | chinese | english | math | username |
+----+--------+---------+---------+------+----------+
| 2 | 李四 | 88.5 | 68 | 96 | NULL |
| 3 | Li | 90 | 90 | 47 | NULL |
+----+--------+---------+---------+------+----------+
2 rows in set (0.00 sec)
mysql> select * from student order by chinese desc;
+----+--------+---------+---------+------+----------+
| id | name | chinese | english | math | username |
+----+--------+---------+---------+------+----------+
| 3 | Li | 90 | 90 | 47 | NULL |
| 2 | 李四 | 88.5 | 68 | 96 | NULL |
| 1 | 张三 | 78.8 | 98 | 66 | NULL |
+----+--------+---------+---------+------+----------+
3 rows in set (0.00 sec)
mysql> select id,name,(chinese+english+math) score from student;
+----+--------+-------+
| id | name | score |
+----+--------+-------+
| 1 | 张三 | 242.8 |
| 2 | 李四 | 252.5 |
| 3 | Li | 227 |
+----+--------+-------+
3 rows in set (0.00 sec)
mysql> select * from (select id,name,(chinese+english+math) score from student) vw order by vw.score;
+----+--------+-------+
| id | name | score |
+----+--------+-------+
| 3 | Li | 227 |
| 1 | 张三 | 242.8 |
| 2 | 李四 | 252.5 |
+----+--------+-------+
3 rows in set (0.00 sec)
一键三连！
一键三连！
一键三连！