How to remove a user from SQL Server 2014?

Question

If I open SQL Server 2014 Management Studio GUI and connect to my database, I can expand the database > Security > Logins to see the list of users that can login.

I'm trying to find out the SQL statement that I can use to remove one of those users (I need an automated solution).

I've tried

drop login 'BUILTIN\Users'

delete from master..syslogins where loginname = 'BUILTIN\Users'

drop user 'BUILTIN\Users'

from the drop commands, I get the error

Incorrect syntax near 'BUILTIN\\Users'

and the delete throws

Ad hoc updates to system catalogs are not allowed

Answer 1

不要使用引号，而是使用括号。

DROP LOGIN [BUILTIN\Users]