How are outer joins implemented within PostgreSQL?
I would like to do a query of the form:
select a.x, b.y from a, b where a.x *= b.x;
The *= operator does not seem to exist. I've been
able to devise some clumsy workarounds by creating
temporary tables:
create table temp_table as select a.x, b.y from a, b where a.x = b.x;
insert into temp_table select x from a except select a.x from a, b where a.x = b.x;
Outer joins are apparently quite common, but I haven't
been able to find anything on this in either the users
guide, the draft of Bruce Momjian's upcoming book or the
Deja News archives.
Charles Mott
