title: DROP USER summary: TiDB 数据库中 DROP USER 的使用概况。

DROP USER

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

  1. DropUserStmt ::=
  2.     'DROP' 'USER' ( 'IF' 'EXISTS' )? UsernameList
  4. Username ::=
  5.     StringName ('@' StringName | singleAtIdentifier)? | 'CURRENT_USER' OptionalBraces

示例

  1. DROP USER 'idontexist';
  1. ERROR 1396 (HY000): Operation DROP USER failed for idontexist@%
  1. DROP USER IF EXISTS 'idontexist';
  1. Query OK, 0 rows affected (0.01 sec)
  1. CREATE USER 'newuser' IDENTIFIED BY 'mypassword';
  1. Query OK, 1 row affected (0.02 sec)
  1. GRANT ALL ON test.* TO 'newuser';
  1. Query OK, 0 rows affected (0.03 sec)
  1. SHOW GRANTS FOR 'newuser';
  1. +-------------------------------------------------+
  2. | Grants for newuser@%                            |
  3. +-------------------------------------------------+
  4. | GRANT USAGE ON *.* TO 'newuser'@'%'             |
  5. | GRANT ALL PRIVILEGES ON test.* TO 'newuser'@'%' |
  6. +-------------------------------------------------+
  7. 2 rows in set (0.00 sec)
  1. REVOKE ALL ON test.* FROM 'newuser';
  1. Query OK, 0 rows affected (0.03 sec)
  1. SHOW GRANTS FOR 'newuser';
  1. +-------------------------------------+
  2. | Grants for newuser@%                |
  3. +-------------------------------------+
  4. | GRANT USAGE ON *.* TO 'newuser'@'%' |
  5. +-------------------------------------+
  6. 1 row in set (0.00 sec)
  1. DROP USER 'newuser';
  1. Query OK, 0 rows affected (0.14 sec)
  1. SHOW GRANTS FOR 'newuser';
  1. 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