Joining a query across servers using Zend_Db and SQL Server

In SQL Server there is a syntax for joining a query across two servers where you use the following:

SELECT 
    SUM(StatsTotal) AS ChannelTotal 
FROM [SERVER\DB4_1].DBNAME.dbo.Stats AS Stats

This means that I can connect to one server and then ask the query to execute on another server using a feature of SQL Server called 'linked servers'. My problem is that in Zend_Db there is no way to use this feature that I can see with Zend_Db_Select.

Currently I'm trying to use the following code:

$select = $this->d开发者_开发百科b->select();
$select->from(array('Stats' => '[SERVER\DB4_1].DBNAME.dbo.Stats'), array('ChannelTotal' => new Zend_Db_Expr('SUM(StatsTotal)')));
echo $select->assemble();

Which gives me the following SQL in response:

SELECT SUM(StatsTotal) AS "ChannelTotal" FROM "[SERVER\DB4_1]"."DBNAME" AS "Stats"

Obviously this will not work, so is there an alternative way to do this without having to hand-write these queries?

Using 'Stats' => new Zend_Db_Expr('[SERVER\DB4_1].DBNAME.dbo.Stats') should work.