It may be possible to bypass the NULL != NULL by using coalesce. Here
is an example:
create table foo2 (
a integer not null,
b integer not null,
c integer null,
UNIQUE (a,b,c)
);
create function foo2_unique_func() RETURNS trigger AS '
DECLARE
isfound integer = 0;
BEGIN
isfound =
What about this as a rule. It seems to work for me.
create or replace rule critter_counter as
on INSERT to critter do (
insert into zoostats
select distinct new.legs
where new.legs not in (select legs from zoostats);
update zoostats set headcount = (
select c
