安装Mysql后在终端输入mysql, mysql

成功启动，退出，再输入mysqladmin -u root password XXXXX， 出现错误：mysqladmin: connect to server at 'localhost' failed

error: 'Access denied for user 'root'@'localhost' (using password: NO)'

如先输入mysql,成功启动后输入use mysql,出现如下错误：Access denied for user ''@'localhost' to database 'mysql'

还有，输mysql可以，输mysql -u root就出错了：

Access denied for user 'root'@'localhost' (using password: NO).

The reason is:

是昨日更新ROOT密码时出错

update user set password = '123456' where user ="root" //这样写是错的，密码其实不是123456

应该为update user set password = password ('123456') where user = "root"

具体操作步骤：

关闭mysql:

# service mysqld stop

然后:

# mysqld_safe --skip-grant-tables（该命令完成后，可能终端不会提示输入下一命令，下面命令在新开的终端中实现）

启动mysql:

# service mysqld start

mysql -u root

mysql> use mysql

mysql> UPDATE user SET Password=PASSWORD('xxx') WHERE user='root';

mysql> flush privileges;

mysql>\q