如此图连接数据库时，学习过程中会遇到各种错误。这不，由于回老家，几天没有动。数据库又连接不上了，出现了曾经出现过的问题（可惜当时只顾解决，未及时总结，以后可不能这样）
这个经典的错误如此图，这也是之前学生和机房之中导致91错误的一大原因。百度上的解决方式很多指向了SQL的配置管理器。提供了解决步骤，可是和我的Win10系统的操作又不尽相同，难以参考。却发现这次仅仅是选择错了服务器名称（当初设置时可要留下记录，忘记就会导致尴尬发生）
At the beginning I chose the server name as the computer name.
The orange progress bar was in the loading state, and then an error was reported until I changed my server name.
Of course, this time I was lucky. But I feel that an error is not often caused by one reason, nor is there only one solution. Besides, all kinds of headaches are often encountered. Welcome every great god to provide new ideas and methods!