T-SQL USE : Reference Database in Different Server

I'm fairly new to SQL so perhaps I am missing something but what I am trying to do is have a script I wrote select a certain database depending on @@ServerName. This script will be run by the testing department and needs to work regardless of connection.
IF @@SERVERNAME IN ('X')
    USE DataBaseA
ELSE IF @@SERVERNAME IN ('Y')
    USE DataBaseB
ELSE
    USE DataBaseC
What happens is DataBaseB does not exist on server X so I receive the error of "no database exists". As well, DataBaseC lacks certain columns in tables that DataBaseA has (DataBaseC will later get these columns but are not there right now).
Is there a different way to force the code to properly use the right database and not throw errors?

Interesting. I was not aware of that.
I suggest you resort to dynamic SQL if possible.
Build your SQL command into a variable, write only one USE STATEMENT into it and run it via EXECUTE.
More about dynamic SQL at
MSDN or from Erland Sommerskog.
Another option could be using SSIS and work with variables there.
Or go to powershell and cmd get the Servername there and fire up sqlcmd with the right commands (you can use parameter -d instead of use).
In the end there could be quite a bunch of work involved depending how much you have to do in your script.
Cheers
Martin

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