Checking if a SQL Server login already exists

Question

I need to check if a specific login already exists on the SQL Server, and if it doesn\'t, then I need to add it.

I have found the following code to actually add the

Answer 1

As a minor addition to this thread, in general you want to avoid using the views that begin with sys.sys* as Microsoft is only including them for backwards compatibility. For your code, you should probably use sys.server_principals. This is assuming you are using SQL 2005 or greater.