Should the following work...?

select id  from clients where id = ( select id                from clients               where count(id) = 1 ) ;

The error I get is that you can't do the AGGREGATE int he WHERE clause,
but this is with a pre-v6.5 server too...technically, should the above be
possible?

Marc G. Fournier                   ICQ#7615664               IRC Nick: Scrappy
Systems Administrator @ hub.org 
primary: scrappy@hub.org           secondary: scrappy@{freebsd|postgresql}.org