title: Does `EXCEPTION WHEN OTHERS THEN RAISE` do something?
body: <p>Being still a newbie in PL/SQL, I've been copying and pasting around the following trigger:</p>
  
  <pre><code>CREATE OR REPLACE TRIGGER FOO_TRG1
      BEFORE INSERT
      ON FOO
      REFERENCING NEW AS NEW OLD AS OLD
      FOR EACH ROW
  BEGIN
      IF :NEW.FOO_ID IS NULL THEN
          SELECT FOO_SEQ1.NEXTVAL INTO :NEW.FOO_ID FROM DUAL;
      END IF;
  
      EXCEPTION
          WHEN OTHERS THEN RAISE;
  END FOO_TRG1;
  /
  ALTER TRIGGER FOO_TRG1 ENABLE;
  </code></pre>
  
  <p>I suspect that the included exception handling code does nothing at all and could simply get removed, since I'll get an error message anyway if something goes wrong. Am I right?</p>
  
  <p><em>(I guess such code is the result of further editing prior code.)</em></p>