Question

DROP USER 语句用于从 TiDB 系统数据库中删除用户。如果用户不存在，使用关键词 IF EXISTS 可避免出现警告。 执行 DROP USER 语句需要拥有 CREATE USER 权限。

语法图

DropUserStmt:

Username:

示例

DROP USER 'idontexist';

ERROR 1396 (HY000): Operation DROP USER failed for idontexist@%

DROP USER IF EXISTS 'idontexist';

Query OK, 0 rows affected (0.01 sec)

CREATE USER 'newuser' IDENTIFIED BY 'mypassword';

Query OK, 1 row affected (0.02 sec)

GRANT ALL ON test.* TO 'newuser';

Query OK, 0 rows affected (0.03 sec)

SHOW GRANTS FOR 'newuser';

+-------------------------------------------------+
| Grants for newuser@%                            |
+-------------------------------------------------+
| GRANT USAGE ON *.* TO 'newuser'@'%'             |
| GRANT ALL PRIVILEGES ON test.* TO 'newuser'@'%' |
+-------------------------------------------------+
2 rows in set (0.00 sec)

REVOKE ALL ON test.* FROM 'newuser';

Query OK, 0 rows affected (0.03 sec)

SHOW GRANTS FOR 'newuser';

+-------------------------------------+
| Grants for newuser@%                |
+-------------------------------------+
| GRANT USAGE ON *.* TO 'newuser'@'%' |
+-------------------------------------+
1 row in set (0.00 sec)

DROP USER 'newuser';

Query OK, 0 rows affected (0.14 sec)

SHOW GRANTS FOR 'newuser';

ERROR 1141 (42000): There is no such grant defined for user 'newuser' on host '%'

MySQL 兼容性

• 在 TiDB 中删除不存在的用户时，使用 IF EXISTS 可避免出现警告。Issue #10196。

另请参阅

• CREATE USER
• ALTER USER
• SHOW CREATE USER
• Privilege Management