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。

语法图

DropUserStmt:

DropUserStmt

Username:

Username

示例

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

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