mysql報錯：Error Code: 1044. Access denied for user 'root'@'%' to database

root用戶新建了一個數據庫，賦權限給用戶A，

grant 權限 on 數據庫.數據表 to '用戶' @ '主機名';

grant all on db_test.* to 'test'@'%';

報錯如下：

[Err] 1044 - Access denied for user 'root'@'%' to database 'db_test'

報錯可以看出root沒有權限，查詢用戶表看root用戶權限

SELECT host,user,Grant_priv,Super_priv FROM mysql.user;

修改權限，執行如下：

UPDATE mysql.user SET Grant_priv='Y', Super_priv='Y' WHERE User='root';
FLUSH PRIVILEGES;