mysql安装error：the security setting could not be applied to the database
错误提示：
The security settings could not be applied to the database because the connection has failed with the following error.
Error Nr. 1045
Access denied for user ‘root’@‘localhost’ (using password: NO)
If a personal firewall is running on your machine, please make sure you have opened the TCP port 3306 for connections. Otherwise no client application can connect to the server. After you have opened the port please press [Retry] to apply the security settings.
If you are re-installing after you just uninstalled the MySQL server please note that the data directory was not removed automatically. Therefore the old password from your last installation is still needed to connect to the server. In this case please select skip now and re-run the Configuration Wizard from the start menu.
这样一般是因为以前安装的mysql没有卸载干净
解决办法：
1.将mysql没有卸载干净，找一下自己安装的MySQL的位置将其删除，我的是这三个文件夹里都有，所以都要删除
2.还要检查一**册表，具体卸载方法https://blog.csdn.net/zf_14159265358979/article/details/87390963这里都有，可能会有遗漏，需要自己挖掘
3.重新安装MySQL就好了（电脑不用重启），出现这样的状态时表示安装成功