Index: Doctrine/Connection/Mssql.php
===================================================================
--- Doctrine/Connection/Mssql.php	(revision 6897)
+++ Doctrine/Connection/Mssql.php	(working copy)
@@ -186,7 +186,9 @@
 
             $fields_string = substr($query, strlen($selectReplace), strpos($query, ' FROM ') - strlen($selectReplace));
             $field_array = explode(',', $fields_string);
-            $aux2 = explode('.', $field_array[0]);
+            $field_array = array_shift($field_array);
+            $aux2 = spliti(' as ', $field_array);
+            $aux2 = explode('.', end($aux2));
             $key_field = trim(end($aux2));
 
             $query = preg_replace('/^'.$selectRegExp.'/i', $selectReplace . 'TOP ' . ($count + $offset) . ' ', $query);