Oracle SELECT TOP 10 records
- by ArneRie
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)