correlated multi-set update?

Hello,

My company recently deployed Pg 7.4.1. on Solaris for an experimental 
project and is using the experience to evaluate its viability for 
migration from Oracle 7.0.

While I like a lot of the features of Pg, one thing I noticed that 
"seems" to be missing is the ability to set multiple fields in an update 
using a correlated subquery.

For example, I have a statement that copies fields from a template (bar) 
into another table (foo) based on a list of keys in a third table (keylist):

UPDATE foo f
SET (f1, f2, f3, f4, f5) = (  SELECT f1, f2, f3, f4, f5  FROM bar b  WHERE f.fk = b.pk  )
WHERE f.pk IN (  SELECT l.pk  FROM keylist l  );

In Oracle this works wonders, but it seems to fail under Pg because Pg 
wants single field updates and does not allow subqueries.

Next I tried:

UPDATE foo f
SET f1 = (  SELECT f1  FROM bar b  WHERE f.fk = b.pk  ),
f2 = (  SELECT f2  FROM bar b  WHERE f.fk = b.pk  ),
f3 = (  SELECT f3  FROM bar b  WHERE f.fk = b.pk  ),
f4 = (  SELECT f4  FROM bar b  WHERE f.fk = b.pk  ),
f5 = (  SELECT f5  FROM bar b  WHERE f.fk = b.pk  )
WHERE f.pk IN (  SELECT l.pk  FROM keylist l  );

That seemed to get closer, but still barfed (apparently) because of a 
lack of table aliasing and correlated subqueries.  This makes the 
process become an iterative one.

Am I missing something here?

Thanks in advance.

Sincerely,
Marty