Alternative for ROW_NUMBER () OVER.

Question

Hi All,
Is there a way to implement the below logic without using ROW_NUMBER () OVER feature that Oracle provides ?
SELECT
cost_object INTO out_cost_object
FROM
SELECT equip_no,
cost_object,
ROW_NUMBER () OVER (PARTITION BY equip_no, trunc(in_date)
ORDER BY start_date) row_number
FROM escost_object_assign
WHERE equip_no = in_equip
AND in_date between start_date and nvl(end_date,sysdate)
WHERE
a.     row_number = 1 ;I want to implement this logic in one of the tool which does not support ROW_NUMBER OVER feature. Please let em know if you need any info.
Thanks and Regards
Nagaraja Akkivalli.

Answer 1

Hi,
can you post the structure of escost_object_assign?
Also from your code it seem you are just returning one row (INTO out_cost_object).
But your analytic function seems to be handling more than one rows as you have partition by equip_no, trunc(in_date)
I suppose you can do something like this.
SELECT cost_object
  INTO out_cost_object
  FROM (SELECT cost_object
          FROM escost_object_assign
         WHERE equip_no = in_equip
           AND in_date BETWEEN start_date AND NVL (end_date, SYSDATE)
         ORDER BY start_date
WHERE ROWNUM <= 1;If not, please post some sample data (CREATE TABLE and INSERT statement) and explain exactly the case.
Beside this I have to say that I totally agree with Blu:
You'd be better to change your tool, rather than perfectly acceptable code.A tool should support entirely the database.
Regards.
Al
Edited by: Alberto Faenza on May 14, 2013 12:07 PM