Trigger after insert on

TRIGGER assist_art_after
   after update or insert or delete on assist_art
   for each row
declare
   key_c varchar2(1);
begin
   if inserting then
      aend_art := 'I';  
      key_c := :new.KEY;
      insert into log_tabelle
      values(key_c, :new.BEZEICHNUNG);
   elsif updating then
      aend_art := 'U';  
      key_c := :new.KEY;
      update log_tabelle
         set T8115_ASSISTENTENART = :new.BEZEICHNUNG
         where T8115_ASS_ARTEN_SCHLUESSEL = key_c;
   elsif deleting then
      aend_art := 'D';  
      key_c := :old.KEY;
      delete from log_tabelle
         where T8115_ASS_ARTEN_SCHLUESSEL = key_c;
   else null;
   end if;
end assist_art_after;