sql - Update trigger when row doesn't exist -

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i have 2 tables orderitems:

"order_items_code" varchar2(20) not null enable,  "order_code" varchar2(20) not null enable,  "item_code_orders" varchar2(20) not null enable,  "order_quantity" number(4,0) not null enable,  "order_unit" varchar2(5) not null enable,  "unit_price" number(38,5),  "ordered_in" varchar2(6),  "or_quantity_ton" number(38,5), "warehouse_code" varchar2(20) not null enable

the other table inventory:

"inventory_code" varchar2(20) not null enable,  "item_code" varchar2(20) not null enable,  "warehouse_code" varchar2(20),   "in_q_ton" number(38,5),  "or_q_ton" number(38,5)

i created trigger calculate "or_quantity_ton" = sum ("or_qn_ton")

create or replace trigger sum_or_it after insert or update or delete on orderitems begin     update inventory set or_q_ton = (         select sum(or_quantity_ton) orderitems                  orderitems.item_code_orders = inventory.item_code         ,         warehouse_code = '1'); end;

this inventory table , column or_q_ton sum of ordered quantity every item,, if item doesn't exist in orders ,, want order quantity zero. want make exception if "item_code_orders" doesn't exist in table "orderitems" or_q_ton = 0

i tried didn't work got (-) not (0) 

exception   when no_data_found     update inventory set or_q_ton = 0 ;

its not exception , , oracle not raise excpetion in case of update above need use sql%rowcount,

try:

if sql%rowcount = 0   update inventory set or_q_ton = 0 ; end if;

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