Isn't that what EXCEPT does?
chris=> create table foo (text text);
CREATE
chris=> insert into foo values('aaa');
INSERT 22153 1
chris=> insert into foo values('bbb');
INSERT 22154 1
chris=> insert into foo values('ccc');
INSERT 22155 1
chris=> select * from foo EXCEPT select 'aaa';
text
----
bbb
ccc
(2 rows)
> If there would be a divide operator, I could write
>
> select name, prename from Person divide select name, prename from
> Officer;
>
> without it, however, things get really complicated:
>
> select name, prename from Person where prename not in ( select prename
> from Officer where Officer.name = Person.name );
>
> This is an easy example. However, I have to deal with about 10 tables in
> a corresponding way.
>
> Any better idea? Will there be a divide operator in PGSQL soon?
>
> Thanks!
>
> Regards
>
> Joerg Fischer
--
Chris Bitmead
http://www.bigfoot.com/~chris.bitmead
mailto:chris.bitmead@bigfoot.com