Hash Join

We are doing a UPDATE with a sub-query on a large table. It is very slow because its doing a nested loop join. I was under the impression that 7.3 will do a hash-join on a sub-query. Is there a way to force it to use the hash-join. Please post an example if you intend to use the directives. Thanks in advance Sent via Deja.com http://www.deja.com/ Before you buy.