SELECT SUM(GILImp) 
  FROM CosGiol 
    WHERE 
      GILObr = 'CAR' AND GILCap = '01' AND GilDes = 'ALB' AND 
      GILTip = 'G' AND GILCosto = 'OB' AND GILFech BETWEEN '31/12/2001' AND '09/06/2006' AND 
      GILImp IS NOT NULL;
      
      