用户如何删除SQL Server组用户？（删除sqlserver组）

SQL Server is one of the most popular relational database management systems (RDBMS) used to store information. As with any database, managing users and permission settings requires privileges that a user must have. In SQL Server, users can be members of either of two groups: a server-level group or a database-level group, and need to be removed from the group to ensure their access is properly secured. This article will discuss how to delete SQL Server group users.

To delete a user from a SQL Server group, the user must first be identified. This can be done through the Object Explorer in SQL Server Management Studio. Expand the Security folder, and then the Logins folder should be visible. There, the user that needs to be removed should be highlighted. Then, right-click on the user, and select “Delete”.

Alternatively, a Transact-SQL query can also be used to delete a user from a SQL Server group. To do this, execute the following command in the Query Editor:

`USE [master];

ALTER LOGIN [LoginName] DROP MEMBER FROM [GroupName]`

Where “LoginName” is replaced by the actual login name of the user, and “GroupName” by the name of the group that the user needs to be removed from. This command will delete the user from the group and they will no longer have any privileges associated with that group.

In addition, SQL Server also provides a sys.server_principals view that can be used to manage users. To delete a user from a SQL server group, execute the following command in the Query Editor:

`ALTER LOGIN [LoginName] WITH DROPMEMBER = ‘[GroupName]’`

This command will effectively remove the user from the group, but will not delete the account.

It must be noted that removing a user from a group does not delete the user from the server. The user will still have access to the server unless their account is also deleted. To delete the user from the server, execute the following command:

`DROP LOGIN [LoginName]`

This command will completely delete the user and their associated information, such as any roles and permissions.

These are the ways that a user can be removed from a group in SQL Server. It is important to remember to use the appropriate commands in order to ensure the security of the database. When a user is removed from a server or from a group, it is critical to make sure that their account is deleted from the server as well.