Запрос как узнать цену товаров на дату : Oracle

SELECT 
STORELOC,
ARTICLE,
PRICE,
MAX (EVENTTIME)
FROM
(select 
PH.STORELOC,
PH.ARTICLE, 
PH.PRICE,
PH.EVENTTIME

from SUPERMAG.SMPRICEHISTORY PH
WHERE PH.PRICETYPE >1
AND PH.EVENTTIME <= TO_DATE('11.08.13','DD.MM.YY')
ORDER BY PH.EVENTTIME DESC)
GROUP BY STORELOC,ARTICLE,PRICE
ORDER BY STORELOC,ARTICLE