获取BOM标准用量

Select dbms_aw.eval_number(listagg(' 1' ||
                                        sys_connect_by_path(component_quantity,
                                                            ' * '),
                                        '+') within Group(Order By 1))
      Into l_sta_quantity
      From (Select bom.assembly_item_id, bic.component_item_id,
                    bom.organization_id, bic.component_quantity,
                    nvl(bic.wip_supply_type, msb.wip_supply_type) comp_wip_type
               From bom_inventory_components bic, bom_bill_of_materials bom,
                    mtl_system_items_b msb
              Where 1 = 1
                And bom.organization_id = msb.organization_id
                And bic.component_item_id = msb.inventory_item_id
                And bom.organization_id = p_organization_id
                And bic.bill_sequence_id = bom.common_bill_sequence_id
                And g_end_date Between bic.effectivity_date And
                    nvl(bic.disable_date, g_end_date + 1)
                And bom.alternate_bom_designator Is Null)
     Where 1 = 1
       And component_item_id = p_comp_id
       And connect_by_root assembly_item_id = p_inventory_item_id
     Start With assembly_item_id = p_inventory_item_id
    Connect By nocycle Prior component_item_id = assembly_item_id
           And Prior organization_id = organization_id
           And Prior comp_wip_type In (5, 6)