The first installation of sql server is the 2016 version, because [the system configuration of the win7-64 version is relatively low], it was unsuccessful.
The second time I installed the 2012 version, when [Database Engine Configuration], I chose [Add Current User], and when I needed to add a user later, I chose [Add Current User], which caused the installation to fail. This is mainly because my computer The user name and password are set to log in to [Computer-Right-Click-Manage-Local Users and Groups], and the Administrator in the user and group uses the corresponding management and mapping permissions, and the current user I added during installation is my computer login user , it has no corresponding management and mapping relationship. Therefore, the error [No mapping between account name and security ID is completed] will be reported during the last step of installation.
The 2012 version was reinstalled for the third time, and an error was reported during the installation process: [The instance name has already been used].
[Solution] Mainly refer to the blog [https://blog.csdn.net/xyy410874116/article/details/26349927]
Step 1: Uninstall.
1. Enter "appwiz.cpl" in the run box to open the control panel, find something about sql server 2012, and uninstall it.
during uninstallation
[Select an instance] In this step, the instance from which the function is to be deleted [Select: the one that was prompted by the previous error message [this instance has been used]].
【Select function】This step:【Select all】-【Next】
The follow-up is basically [Next]
Step 2: Reinstall sql server2012.
during installation
In order to use only the necessary functions, in the [Function Selection] step, [Instance Function] only selects [Database Engine Service] + [SQL Server Replication], and [Shared Function] only selects [Administrative Tools - Basic] + [ Complete management tools].
[Instance configuration] In this step, select [Default instance]
In the [Database Engine Configuration] step, select [Mixed sql server authentication and Windows authentication] - you need to enter a password, for example, I enter 123456, point to the sql server here, add - select administrator, (because in my computer, the administrator has Administrative permissions have the relationship between corresponding users and groups)
Everything else is basically [Next]. Successful installation.
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When logging in, sql server2012 windows cannot connect to the server error 18456.
Solution: refer to [https://blog.csdn.net/xiaoshiyiqie/article/details/52534323]
Log in with sa, the password is entered during installation: 123456
After logging in: File - New - Query using the current connection
Enter the command: CREATE LOGIN [sandy-PC\sandy] FROM WINDOWS Click the execute button, then log out of sa and log in with windows.
Among them, sandy-PC\sandy in the above command line is the user name prompted by Windows when logging in, and the square brackets [] in the command should be retained.
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To use sql server, you need to start the service. There are two methods:
Method 1. Computer - right click - management - services and applications - sql server configuration manager - sql server service
Method 2. All programs - find sqlserver2012 - configuration tool - sql server configuration manager - [the following steps are the same as method 1]
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Start your sql journey :)