Type 'help;' or 'h' for help. Type 'c' to clear the buffer.

mysql> select user,host,password from mysql.user;　 ← 查看用戶信息
+------+------------------------------+---------------+
| user | host 　　　　　　　　　| password　|
+------+------------------------------+---------------+
| root | localhost　　　　 　　　| 　　　　　　|　 ← root密碼為空
| root | sample.centospub.com　 |　　　　　　 |　 ← root密碼為空
|　　　| sample.centospub.com | 　　　　　　|
|　　　| localhost　　　　　　 | 　　　　　　|
+------+------------------------------+---------------+
4 rows in set (0.00 sec)

mysql> set password for root@localhost=password('在這里填入root密碼');　 ← 設置root密碼
Query OK, 0 rows affected (0.01 sec)

mysql> set password for root@'sample.centospub.com'=password('在這里填入root密碼');　 ← 設置root密碼
Query OK, 0 rows affected (0.01 sec)

mysql> select user,host,password from mysql.user;　 ← 查看用戶信息
+------+--------------------------------+--------------------------+
| user | host　　　　　　　　　　| password　　 　　|
+------+--------------------------------+--------------------------+
| root | localhost　　　　　　　　| 19b68057189b027f |　 ← root密碼被設置
| root | sample.centospub.com　　 | 19b68057189b027f |　 ← root密碼被設置
| 　　 | sample.centospub.com　　 | 　　　　　　　　　|
| 　　 | localhost　　　　　　　　|　　　　　　　　　 |
+------+--------------------------------+--------------------------+
4 rows in set (0.01 sec)

Type 'help;' or 'h' for help. Type 'c' to clear the buffer.

mysql> exit
Bye

[root@sample ~]# mysql -u root -h sample.centospub.com -p　 ← 通過密碼用root登錄
Enter password:　 ← 在這里輸入密碼

Welcome to the MySQL monitor. Commands end with ; or g.　 ← 確認用密碼能夠成功登錄
Your MySQL connection id is 6 to server version: 4.1.20

Type 'help;' or 'h' for help. Type 'c' to clear the buffer.

Type 'help;' or 'h' for help. Type 'c' to clear the buffer.

mysql> select user,host from mysql.user;　 ← 查看用戶信息
+------+----------------------------+
| user | host　　　　　　　　 |
+------+----------------------------+
|　　　| localhost 　　　　　　|
| root | localhost 　　　　　　|
|　　　| sample.centospub.com |
| root | sample.centospub.com　 |
+------+----------------------------+
4 rows in set (0.02 sec)

mysql> delete from mysql.user where user='';　 ← 刪除匿名用戶
Query OK, 2 rows affected (0.17 sec)

mysql> select user,host from mysql.user;　 ← 查看用戶信息
+------+----------------------------+
| user | host　　　　　　　　 |
+------+----------------------------+
| root | localhost　　　　　　|
| root | sample.centospub.com |
+------+----------------------------+
2 rows in set (0.00 sec)

Type 'help;' or 'h' for help. Type 'c' to clear the buffer.

mysql> show databases;　 ← 查看系統已存在的數據庫
+-------------+
| Database |
+-------------+
| mysql　　 |
| test　　　|
+------------+
2 rows in set (0.02 sec)

mysql> drop database test;　 ← 刪除名為test的空數據庫
Query OK, 0 rows affected (0.07 sec)

mysql> show databases;　 ← 查看系統已存在的數據庫
+-------------+
| Database |
+-------------+
| mysql 　　|　 ← 確認名為test的數據庫被刪除，已不存在
+-------------+
1 row in set (0.00 sec)

Type 'help;' or 'h' for help. Type 'c' to clear the buffer.

mysql> grant all privileges on test.* to centospub@localhost identified by '在這里定義密碼';　 ← 建立對test數據庫有完全操作權限的名為centospub的用戶
Query OK, 0 rows affected (0.03 sec)

mysql> select user from mysql.user where user='centospub';　 ← 確認centospub用戶的存在與否
+---------+
| user 　|
+---------+
| centospub |　 ← 確認centospub已經被建立
+---------+
1 row in set (0.01 sec)

mysql> exit　 ← 退出MySQL服務器
Bye

[root@sample ~]# mysql -u centospub -p　 ← 用新建立的centospub用戶登錄MySQL服務器
Enter password:　 ← 在這里輸入密碼

Welcome to the MySQL monitor. Commands end with ; or g.
Your MySQL connection id is 10 to server version: 4.1.20

Type 'help;' or 'h' for help. Type 'c' to clear the buffer.

mysql> create database test;　 ← 建立名為test的數據庫
Query OK, 1 row affected (0.00 sec)

mysql> show databases;　 ← 查看系統已存在的數據庫
+-------------+
| Database |
+-------------+
| test 　　　|
+-------------+
1 row in set (0.00 sec)

mysql> use test　 ← 連接到數據庫
Database changed

mysql> create table test(num int, name varchar(50));　 ← 在數據庫中建立表
Query OK, 0 rows affected (0.03 sec)

mysql> show tables;　 ← 查看數據庫中已存在的表
+-------------------+
| Tables_in_test |
+-------------------+
| test　　　　　|
+-------------------+
1 row in set (0.01 sec)

mysql> insert into test values(1,'Hello World!');　 ← 插入一個值到表中
Query OK, 1 row affected (0.02 sec)

mysql> select * from test;　 ← 查看數據庫中的表的信息
+------+-------------------+
| num | name 　　　　　|
+------+-------------------+
| 1 　　| Hello World! 　|
+------+-------------------+
1 row in set (0.00 sec)

mysql> update test set name='Hello Everyone!';　 ← 更新表的信息，賦予新的值
Query OK, 1 row affected (0.00 sec)
Rows matched: 1 Changed: 1 Warnings: 0

mysql> select * from test;　 ← 查看數據庫中的表的信息
+------+----------------------+
| num | name　　　　　 |
+------+----------------------+
| 1 　　| Hello Everyone! |　 ← 確認被更新到新的值
+------+----------------------+
1 row in set (0.01 sec)

mysql> delete from test where num=1;　 ← 刪除表內的值
Query OK, 1 row affected (0.00 sec)

mysql> select * from test;　 ← 確認刪除結果
Empty set (0.01 sec)

mysql> drop table test;　 ← 刪除表
Query OK, 0 rows affected (0.01 sec)

mysql> show tables;　 ← 查看表信息
Empty set (0.00 sec)　 ← 確認表已被刪除

mysql> drop database test;　 ← 刪除名為test的數據庫
Query OK, 0 rows affected (0.01 sec)

mysql> show databases;　 ← 查看已存在的數據庫
Empty set (0.01 sec)　 ← 確認test數據庫已被刪除（這里非root用戶的關系，看不到名為mysql的數據庫）