One more time on ONE-TO-MANY

CC me, I'm digesting this list.

From:
    http://www.sum-it.nl/cursus/dbdesign/english/intro030.php3
A quote:
    ' In addition *the database designer chooses* an action for delete:

    * It's /only possible/ to delete a row in the one-table when there a
      no more related many-rows.
    * When deleting a row the RDBMS
      <http://www.sum-it.nl/cursus/dbdesign/english/intro030.php3#rdbms>
      /automatically/ deletes the related data in the many table. This
      is called a /cascaded delete/.
    * When deleting the last 'many' the RDBMS /automatically/ deletes
      the related 'one' row.'

I'm pretty sure that Postgres does not support the last one
automatically. I shall have to do that one by either a chron script or a
post trigger.

Does anyone have experience with a database that will do the last one,
and what database would that be?