參考前文利用安全模式成功登陸，然后修改密碼，等于給MySql設置了密碼。登陸進去后，想創建一個數據庫測試下。得到的結果確實： 

ERROR 1820 (HY000): You must SET PASSWORD before executing this statement 

非常詭異啊，明明用密碼登陸進去了，怎么還提示需要密碼。 
參考官方的一個文檔，見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');這句話重新設置一次密碼！大爺的，真費勁啊。 
這位仁兄也遇到了相同的問題。 


最近新裝好的mysql在進入mysql工具時，總是有錯誤提示: 

# 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)' 

現在終于找到解決方法了。本來準備重裝的，現在不必了。 
方法操作很簡單，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';//把空的用戶密碼都修改成非空的密碼就行了。 
mysql> FLUSH PRIVILEGES; 
mysql> quit # /etc/init.d/mysqld restart 
# mysql -uroot -p 
Enter password: <輸入新設的密碼newpassword> 

MySql5.6操作時報錯：You must SET PASSWORD before executing this statement解決 
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');這句話重新設置一次密碼！