创建用户cat 密码 123456 CREATE USER ‘cat‘@‘host‘ IDENTIFIED BY ‘123456‘;
修改user表中的注册用户cat update user set host=‘%‘ where user=‘cat‘;
授权:这次是失败的，没关系再来一次 Grant all privileges on *.* to ‘cat‘@‘%‘;
再授权:这次就ok了 Grant all privileges on *.* to ‘cat‘@‘%‘;
如果无法连接navicat就运行下面这个语句
alter user test identified with mysql_native_password by ‘xxx‘；
以下是mysql用户操作CREATE USER ‘username‘@‘host‘ IDENTIFIED BY ‘password‘;
%CREATE USER ‘dog‘@‘localhost‘ IDENTIFIED BY ‘123456‘; CREATE USER ‘pig‘@‘192.168.1.101_‘ IDENDIFIED BY ‘123456‘; CREATE USER ‘pig‘@‘%‘ IDENTIFIED BY ‘123456‘; CREATE USER ‘pig‘@‘%‘ IDENTIFIED BY ‘‘; CREATE USER ‘pig‘@‘%‘;
GRANT privileges ON databasename.tablename TO ‘username‘@‘host‘
SELECT，INSERT，UPDATE等，如果要授予所的权限则使用ALL*表示，如*.*GRANT SELECT, INSERT ON test.user TO ‘pig‘@‘%‘; GRANT ALL ON *.* TO ‘pig‘@‘%‘; GRANT ALL ON maindataplus.* TO ‘pig‘@‘%‘;
用以上命令授权的用户不能给其它用户授权，如果想让该用户可以授权，用以下命令:
GRANT privileges ON databasename.tablename TO ‘username‘@‘host‘ WITH GRANT OPTION;
SET PASSWORD FOR ‘username‘@‘host‘ = PASSWORD(‘newpassword‘);
如果是当前登陆用户用:
SET PASSWORD = PASSWORD("newpassword");
SET PASSWORD FOR ‘pig‘@‘%‘ = PASSWORD("123456");
REVOKE privilege ON databasename.tablename FROM ‘username‘@‘host‘;
privilege, databasename, tablename：同授权部分
REVOKE SELECT ON *.* FROM ‘pig‘@‘%‘;
假如你在给用户‘pig‘@‘%‘授权的时候是这样的（或类似的）：GRANT SELECT ON test.user TO ‘pig‘@‘%‘，则在使用REVOKE SELECT ON *.* FROM ‘pig‘@‘%‘;命令并不能撤销该用户对test数据库中user表的SELECT 操作。相反，如果授权使用的是GRANT SELECT ON *.* TO ‘pig‘@‘%‘;则REVOKE SELECT ON test.user FROM ‘pig‘@‘%‘;命令也不能撤销该用户对test数据库中user表的Select权限。
具体信息可以用命令SHOW GRANTS FOR ‘pig‘@‘%‘; 查看。
DROP USER ‘username‘@‘host‘;
参考：
http://blog.csdn.net/piaocoder/article/details/53704126
https://blog.csdn.net/qq_34680444/article/details/86238516
原文：https://www.cnblogs.com/51python/p/10841228.html