How to select 0's when a select statement returns no rows

Hi,
I'm using the following query in one of the report.
SELECT mtrl.inventory_item_id
     ,mtrl.organization_id
     ,mtrl.to_subinventory_code
     ,NVL(SUM(mtrl.quantity),0)quantity
     ,NVL(SUM(mtrl.quantity_delivered),0)quantity_delivered
FROM mtl_txn_request_lines mtrl, mtl_system_items_b msi
WHERE mtrl.inventory_item_id = msi.inventory_item_id
AND mtrl.organization_id     = msi.organization_id
AND mtrl.reference_type_code = 2
AND UPPER(mtrl.TO_subinventory_code) = NVL(UPPER(DECODE(:p_sub_inv,'ALL','',:p_sub_inv)),UPPER(mtrl.TO_subinventory_code))
AND TRUNC(mtrl.CREATION_date) BETWEEN NVL(TRUNC(TO_DATE(:p_from_date,'yyyy/mm/dd hh24:mi:ss')),TRUNC(mtrl.CREATION_DATE) )
AND NVL(TRUNC(TO_DATE(:p_to_date,'yyyy/mm/dd hh24:mi:ss')),TRUNC(mtrl.CREATION_DATE))
GROUP BY mtrl.inventory_item_id,
     mtrl.organization_id,
     mtrl.to_subinventory_code
For the perticular subinventory in that period there may not be data so the query returns no rows(ALL NULLs) in that case I need to get all 0's instead of NULL.
I tried with UNION but it results in extra row when there is data. I need 0's only when the above query returns no rows.
Any help in this regard is highly appreciated.

My report uotput looks like this:
Subinventory | Part Code |Part Description |Ordered Qty | Received Qty
Mentone St | BATT | non serialised item | |
Mentone St | SONY | spare parts MIN MAX | 30| 0
In the above report
subinventory, Part Code, Part description are in one repeating frame and Ordered and received qty are in other repeating frame.
for a perticular part code there may not be ordered or received quantities. in that case report is showing null(blank) but I want to print ZERO there.
If I use NVL in the query it'll effect only when the query fetches some rows.

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Joel P�rez

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