How to qualify variable inside trigger body (PL/SQL )?
Interesting question.  As far as I can tell, this is not possible, though it seems like it should be.  Unless someone else can show how it can be done, a workaround would be to nest the code in a block:

create or replace trigger trg_before_insert_temp1 before insert on temp1 for each row
declare
begin
   &lt;&lt;bob&gt;&gt; declare
      int_val int;
   BEGIN
      bob.int_val := 0; 
   END;
end trg_before_insert_temp1;