Hi,

i have an big problem with an SQL Statement in Oracle. I want to select The TOP 10 Records ordered by STORAGE_DB wich arent in a list from an other select statement.

This one works fine for all records:

SELECT DISTINCT 
  APP_ID, 
  NAME, 
  STORAGE_GB, 
  HISTORY_CREATED, 
  TO_CHAR(HISTORY_DATE, 'DD.MM.YYYY') AS HISTORY_DATE  
  FROM HISTORY WHERE 
      STORAGE_GB IS NOT NULL AND 
        APP_ID NOT IN (SELECT APP_ID FROM HISTORY WHERE TO_CHAR(HISTORY_DATE, 'DD.MM.YYYY') = '06.02.2009') 

But when i am adding

AND ROWNUM <= 10
ORDER BY STORAGE_GB DESC

im getting some kind of "random" Records. I think because the limit takes in place before the order.

Does someone has an good solution? The other problem: This query is realy slow (10k+ records)