SELECT CASE WHEN (GROUPING(sob.name)=1) THEN 'Total'
   ELSE ISNULL(sob.name, 'unknown') END AS 'Table',
   SUM(sys.length) AS Byte_Length
FROM sysobjects sob, syscolumns sys
WHERE sob.xtype='u' AND sys.id=sob.id
GROUP BY sob.name
WITH CUBE