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用这个:
select parent_item,child_item,qty_per,lpad(' ',2*(level-1))|| child_item
from (select c.segment1 as parent_item,d.segment1 as child_item,
b.component_quantity as qty_per
from bom_bill_of_materials a,bom_inventory_components b,
mtl_system_items_b c,mtl_system_items_b d
where a.bill_sequence_id = b.bill_sequence_id
and a.assembly_item_id = c.inventory_item_id
and c.organization_id = ??
and b.component_item_id = d.inventory_item_id
and d.organization_id = ??)
start with parent_item = item
connect by prior child_item = parent_item |
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