http://blog.csdn.net/yangyu112654374/article/details/4251624 比如一条sql语句 select * from TABLE1 where A1=1 and A2=2 and A3=3 order by A4 ASC; 优化后是这样: select A4,A1,A2 ... FROM TABLE1 where A1=1 and A2=2 and A3=3 order by A4 ASC; 并且给 A4,A1,A2,A3加索引,使用order…
mysql Access denied for user \'root\'@\'localhost\'”解决办法总结,下面我们对常见的出现的一些错误代码进行分析并给出解决办法,有需要的朋友可参考一下. 错误代码 1045 Access denied for user 'root'@'localhost' (using password:YES) 解决办法是重新设置root用户密码,在Windows平台下操作步骤如下:1.以系统管理员身份登录到系统:2.如果MySQL服务器正在运行,停止它. 如…
From: http://blog.sina.com.cn/s/blog_716844910100welz.html 在linux下使用mysql客户端连接远程mysql服务器报错: [root@Server huage]# mysql -h 88.88.88.88 -P 3306 -u root -p Enter password: ERROR 1130 (HY000): Host 'my_wan_ip' is not allowed to connect to this MySQL serv…