Index: library/Zend/Db/Adapter/Pdo/Mssql.php
===================================================================
--- library/Zend/Db/Adapter/Pdo/Mssql.php	(revision 17661)
+++ library/Zend/Db/Adapter/Pdo/Mssql.php	(working copy)
@@ -218,10 +218,20 @@
      */
     public function describeTable($tableName, $schemaName = null)
     {
+        if (!is_null($schemaName)) {
+            if (strpos($schemaName, '.') !== false) {
+                $result = explode('.', $schemaName);
+                $schemaName = $result[1];
+            }
+        }
         /**
          * Discover metadata information about this table.
          */
         $sql = "exec sp_columns @table_name = " . $this->quoteIdentifier($tableName, true);
+        if (!is_null($schemaName)) {
+            $sql .= ", @table_owner = " . $this->quoteIdentifier($schemaName, true);
+        }
+        
         $stmt = $this->query($sql);
         $result = $stmt->fetchAll(Zend_Db::FETCH_NUM);
 
@@ -239,6 +249,10 @@
          * Discover primary key column(s) for this table.
          */
         $sql = "exec sp_pkeys @table_name = " . $this->quoteIdentifier($tableName, true);
+        if (!is_null($schemaName)) {
+            $sql .= ", @table_owner = " . $this->quoteIdentifier($schemaName, true);
+        }
+        
         $stmt = $this->query($sql);
         $primaryKeysResult = $stmt->fetchAll(Zend_Db::FETCH_NUM);
         $primaryKeyColumn = array();
@@ -378,4 +392,4 @@
             return null;
         }
     }
-}
\ No newline at end of file
+}