Advise on Multiple Column Updates

Using SQL2000, is there another way of optimizing the original query below.
TIA,
Bob

Update Transaction
set field1 = (select (sum(tax)-sum(credit))/sum(credit) from tblOrder where
tblOrder.id = Transaction.id),
field2 = (select avg(price) from tblOrder where tblOrder.id =
Transaction.id),
field3 = (select min(cost) from tblOrder where tblOrder.id = Transaction.id)
etc..
(there are six additional updates)

Is this a quicker way:

Update Transaction
SET field1 = (sum(tax)-sum(credit))/sum(credit) , field2 = avg(price) ,
field3 = min(cost) , etc....
FROM tblOrder
WHERE tblOrder.id = Transaction.idThe format is:
UPDATE <table> SET (<columnlist>) = (SELECT <select_list> FROM ...)
WHERE ...

Cheers
Serge

--
Serge Rielau
DB2 SQL Compiler Development
IBM Toronto Lab