SQL query not working well

Question

Hi,
I made a small table with 5 rows and want to make them an sql consult using rownum
so I'm running
select * from mytable where rownum = 1;and it gives me the first row but if I change the 1 for a 2 or 3 or 4 or 5 it's says that theres nothing :S
why?????????????????????
but if i change for between 1 and 5 it gave me the 4 rows :S :S
why???????????????????

Answer 1

AlanWms wrote:
try this:
SELECT *
FROM (
SELECT bne.*, rownum myrow
FROM BAN_EVENTOS_CONFIRMACION bne WHERE ROWNUM <=5)
WHERE myrow = 2;
Wrong!!! Rows in table are not stored in any specific order. Rows are fetched based on execution plan. So if execution plan changed query will retrieve same rows but they can be fetched in a different order. Bottom line only ORDER BY guarantees order. Without ORDER BY there is no sense to talk about first row, second row, last row or any row position.
SY.