一点背景知识：不久前，我用“me”替换了“root”用户，但忘记让“me”访问“mysql”表。今晚我使用“--skip-grant-tables”运行“安全”模式，这帮助我再次获得访问权限：
UPDATE mysql.user SET Grant_priv='Y', Super_priv='Y' WHERE User='me';
但是，我想知道这是否授予“我”可能的最大权限？我只是想确保“我”具有完全访问权限。我不想在一年后发现这个用户缺乏我在危机期间需要的一些超能力。
这尤其让我摸不着头脑：
mysql> grant all on *.* to me@localhost with grant option;
Query OK, 0 rows affected (0.11 sec)
0行是否因为“我”已经拥有所有权限而受到影响，还是我做错了什么？
试试这个：
SELECT * FROM `information_schema`.`SCHEMA_PRIVILEGES`;
或者
SELECT * FROM `information_schema`.`USER_PRIVILEGES`;
为您的用户更改 root 用户...
SELECT Host, Select_priv, Insert_priv, Update_priv, Delete_priv FROM mysql.user WHERE USER = "root";
SELECT Host, Create_priv, Drop_priv, Reload_priv, Shutdown_priv FROM mysql.user WHERE USER = "root";
SELECT Host, Process_priv, File_priv, Grant_priv, References_priv FROM mysql.user WHERE USER = "root";
SELECT Host, Index_priv, Alter_priv, Show_db_priv, Super_priv FROM mysql.user WHERE USER = "root";
SELECT Host, Create_tmp_table_priv, Lock_tables_priv, Execute_priv FROM mysql.user WHERE USER = "root";
SELECT Host, Repl_slave_priv, Repl_client_priv, Create_view_priv FROM mysql.user WHERE USER = "root";
SELECT Host, Show_view_priv, Create_routine_priv, Alter_routine_priv FROM mysql.user WHERE USER = "root";
SELECT Host, Create_user_priv, Event_priv, Trigger_priv, Create_tablespace_priv FROM mysql.user WHERE USER = "root";
SELECT Host, ssl_type , ssl_cipher , x509_issuer, x509_subject, max_questions FROM mysql.user WHERE USER = "root";
SELECT Host, max_updates, max_connections, max_user_connections FROM mysql.user WHERE USER = "root";
SELECT Host, plugin, authentication_string FROM mysql.user WHERE USER = "root";
这里也有一些很好的信息：
show grants;
https://serverfault.com/questions/386903/mysql-grant-option
例如“为了能够对另一个或新用户执行 GRANT ALL，发出 GRANT ALL 的用户自己必须拥有所有权限，否则授权将失败。”
做就是了：
USE mysql;
SELECT * FROM `user` WHERE user = 'me' AND host = 'localhost';
如果你看到所有但Y没有N你有完整的：D