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

DropUserStmt
DROPUSERIFEXISTSUsernameList
Username
StringName@StringNamesingleAtIdentifierCURRENT_USEROptionalBraces

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