> NOT EXISTS (SELECT NULL FROM dyr_pause_mot WHERE avlsnr = a.avlsnr) > > This can be executed as anti-join and is often more efficient. This got my interest! It's of great interest to me to know how and when Postgres performs an anti-join (this being a significant omission from SQL). Is this a reliable trigger: (NOT EXISTS <subselect>)? Regards David M Bennett FACS Andl - A New Database Language - andl.org -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
