CREATE USER 
================================



描述 
-----------

该语句用于创建新的 OceanBase 用户。创建新用户后，可以使用该用户连接 OceanBase。
**说明**



必须拥有全局的CREATE USER权限，才可以使用CREATE USER命令。

格式 
-----------

```javascript
create_user_stmt:
    CREATE USER [IF NOT EXISTS] user_name [IDENTIFIED BY 'password'];

alter_user_stmt:
      ALTER USER user_name ACCOUNT {LOCK | UNLOCK};
    | ALTER USER user_name IDENTIFIED BY 'password';
    | SET PASSWORD [FOR user_name] = PASSWORD('password');
    | RENAME USER rename_user_action_list;

drop_user_stmt:
    DROP USER user_name_list;

rename_user_action_list:
    rename_user_action [, rename_user_action ...]

rename_user_action:
    user_name TO user_name

user_name_list:
    user_name [, user_name ...]

password:
    STR_VALUE
    
CREATE USER [IF NOT EXISTS] user_specification_list;

user_specification_list:
user_specification [, user_specification ...]

user_specification:
user IDENTIFIED BY  'authstring'
| user IDENTIFIED BY PASSWORD 'hashstring'
```



参数解释 
-------------



|                  **参数**                  |                       **描述**                       |
|------------------------------------------|----------------------------------------------------|
| user_name                                | 用户名，新建用户后，"mysql.user"表会新增一行该用户的表项。如果同名用户已经存在，则报错。 |
| IDENTIFIED BY                            | 使用自选的 IDENTIFIED BY 子句，可以为账户给定一个密码。                |
| user_name \[, user_name ...\]            | 同时创建多个用户时，用","隔开。                                  |
| user IDENTIFIED BY  'authstring'         | 此处密码为明文，存入"mysql.user"表后，服务器端会变为密文存储下来。            |
| user IDENTIFIED BY PASSWORD 'hashstring' | 此处密码为密文。                                           |



示例 
-----------

1. 执行以下命令创建名为 sqluser01 和 sqluser02 的用户，密码均为 123456。 




```javascript
CREATE USER 'sqluser01' IDENTIFIED BY '123456', 'sqluser02' IDENTIFIED BY '123456';
```



2. 执行以下命令查看创建的用户。




```javascript
SELECT user FROM mysql.user;
```



执行结果如下所示。

```javascript
mysql> CREATE USER 'sqluser01' IDENTIFIED BY '123456', 'sqluser02' IDENTIFIED BY '123456';
Query OK, 0 rows affected (0.12 sec)
mysql> select user from mysql.user;
+-----------+
| user      |
+-----------+
| root      |
| admin     |
| sqluser01 |
| sqluser02 |
+-----------+
4 rows in set (0.00 sec)
```



