• DROP USER
    • 语法图
    • 示例
    • MySQL 兼容性
    • 另请参阅

    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

    1. mysql> DROP USER idontexist;
    2. ERROR 1396 (HY000): Operation DROP USER failed for idontexist@%
    3. mysql> DROP USER IF EXISTS idontexist;
    4. Query OK, 0 rows affected (0.01 sec)
    5. mysql> CREATE USER newuser IDENTIFIED BY 'mypassword';
    6. Query OK, 1 row affected (0.02 sec)
    7. mysql> GRANT ALL ON test.* TO 'newuser';
    8. Query OK, 0 rows affected (0.03 sec)
    9. mysql> SHOW GRANTS FOR 'newuser';
    10. +-------------------------------------------------+
    11. | Grants for newuser@% |
    12. +-------------------------------------------------+
    13. | GRANT USAGE ON *.* TO 'newuser'@'%' |
    14. | GRANT ALL PRIVILEGES ON test.* TO 'newuser'@'%' |
    15. +-------------------------------------------------+
    16. 2 rows in set (0.00 sec)
    17. mysql> REVOKE ALL ON test.* FROM 'newuser';
    18. Query OK, 0 rows affected (0.03 sec)
    19. mysql> SHOW GRANTS FOR 'newuser';
    20. +-------------------------------------+
    21. | Grants for newuser@% |
    22. +-------------------------------------+
    23. | GRANT USAGE ON *.* TO 'newuser'@'%' |
    24. +-------------------------------------+
    25. 1 row in set (0.00 sec)
    26. mysql> DROP USER newuser;
    27. Query OK, 0 rows affected (0.14 sec)
    28. mysql> SHOW GRANTS FOR newuser;
    29. 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