Oracle trigger -- easy update

How can I setup the below as an Oracle trigger so it runs anytime I update the vendor's QC_DATE field ?

update supplier_tab
and QC_DATE changed
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slightwv (䄆 Netminder) Commented:
If I understand correctly (if not please provide more information):

create or replace trigger supp_tab_trig
before update of qc_date on supplier_tab
for each row
:new.date_del := :old.qc_date + 730;

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I think you probably want to use :new.qc_date, rather than :old.qc_date

and a side note,  if the goal is to add 2 years,  you might want to try adding 24 months instead

:new.date_del := add_months(:new.qc_date,24)

it's a minor thing, but 2012 is a leap year, so the 24 month method should accomodate that better
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