On Sun, Apr 16, 2006 at 07:07:11PM +0300, pgsql-general@xxxxxxxxxxxxxxxx wrote: > I am interested to know if I can define an unique index on a timestamp > column to reject values within one hour. Last month I posted an idea for enforcing unique constraints on date ranges by using a composite type and a custom comparison operator: http://archives.postgresql.org/pgsql-sql/2006-03/msg00055.php The warning about the code being only minimally tested still stands but maybe it'll give you some ideas. -- Michael Fuhr