Auto update of timestamp with trigger

I have a timestamp data element that we want to be updated via a trigger whenever a row is inserted or updated.
My trigger looks something like -
create trigger "name"
before insert or update on "table"
for each row
begin
:new.create_timestamp:=systimestamp;
end
create_timestamp is defined as timestamp(9)
everything compiles and we can insert data without problem but the create_timestamp element is null. What wrong here?
thanks

What version of Oracle are you using? If you are at 8i or lower, your column datatype should be DATE and you should be assigning SYSDATE to the value (e.g., select SYSDATE from dual;). I don't know the answer if you're on 9i.
Tim

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