text: WITH DB_CPU_Stats
  AS
  (SELECT DatabaseID, DB_Name(DatabaseID) AS [DatabaseName], 
    SUM(total_worker_time) AS [CPU_Time_Ms]
   FROM sys.dm_exec_query_stats AS qs
   CROSS APPLY (SELECT CONVERT(int, value) AS [DatabaseID] 
                FROM sys.dm_exec_plan_attributes(qs.plan_handle)
                WHERE attribute = N'dbid') AS F_DB
   GROUP BY DatabaseID)
  SELECT ROW_NUMBER() OVER(ORDER BY [CPU_Time_Ms] DESC) AS [row_num],
         DatabaseName, [CPU_Time_Ms], 
         CAST([CPU_Time_Ms] * 1.0 / SUM([CPU_Time_Ms]) 
         OVER() * 100.0 AS DECIMAL(5, 2)) AS [CPUPercent]
  FROM DB_CPU_Stats
  WHERE DatabaseID > 4 -- system databases
  AND DatabaseID <> 32767 -- ResourceDB