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参考前文利用安全模式成功登陆,然后修改密码,等于给MySql设置了密码。登陆进去后,想创建一个数据库测试下。得到的结果确实:  ERROR 1820 (HY000): You must SET PASSWORD before executing this statement  非常诡异啊,明明用密码登陆进去了,怎么还提示需要密码。  参考官方的一个文档,见http://dev.mysql.com/doc/refman/5.6/en/alter-user.html。如下操作后就ok了:  mysql> create database yan1;  ERROR 1820 (HY000): You must SET PASSWORD before executing this statement  mysql> SET PASSWORD = PASSWORD('123456');  Query OK, 0 rows affected (0.03 sec)  mysql> create database yan1;  Query OK, 1 row affected (0.00 sec)  也就是用mysql> SET PASSWORD = PASSWORD('123456');这句话重新设置一次密码!大爷的,真费劲啊。  这位仁兄也遇到了相同的问题。  最近新装好的mysql在进入mysql工具时,总是有错误提示:  # mysql -u root -p  Enter password:  ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)  或者  # mysql -u root -p password 'newpassword'  Enter password:  mysqladmin: connect to server at 'localhost' failed  error: 'Access denied for user 'root'@'localhost' (using password: YES)'  现在终于找到解决方法了。本来准备重装的,现在不必了。  方法操作很简单,如下:  # /etc/init.d/mysql stop  # mysqld_safe --user=mysql --skip-grant-tables --skip-networking &  # mysql -u root mysql  mysql> UPDATE user SET Password=PASSWORD('newpassword') where USER='root' and host='root' or host='localhost';//把空的用户密码都修改成非空的密码就行了。  mysql> FLUSH PRIVILEGES;  mysql> quit # /etc/init.d/mysqld restart  # mysql -uroot -p  Enter password: <输入新设的密码newpassword>  MySql5.6操作时报错:You must SET PASSWORD before executing this statement解决  mysql> SET PASSWORD = PASSWORD('123456');  Query OK, 0 rows affected (0.03 sec)  mysql> create database roger;  Query OK, 1 row affected (0.00 sec)  也就是用mysql> SET PASSWORD = PASSWORD('123456');这句话重新设置一次密码!