On-hand Quatity of one Particular Item in whole Organization

select sum(primary_transaction_quantity) from mtl_onhand_quantities_detail where inventory_item_id = ‘Your Inventory Organization ID’;

Example:-

Note:- 123456 is the item ID of the particular item. This can be found in the base table of the item (MTL_SYSTEM_ITEMS_B). SEGMENT1 column of this table would have Item Name and Inventory_item_id is the primary column of the table. The follow query is using this value.

select sum(primary_transaction_quantity) from mtl_onhand_quantities_detail where inventory_item_id = 123456;

If you want to know the on-hand Quantity of particular item at all the Inventory Organization then use the following the Query.

select sum(primary_transaction_quantity), organization_id from mtl_onhand_quantities_detail where inventory_item_id = ‘Your Inventory Organization ID’
group by organization_id;