What was suggested above would be the best guide, aside for that, there aren't any formatting checks in the embedded Python code, so as long as you select the po_id and an aggregate function AS total_cost, that side of it should be fine.

If it can be done a different way then that's fine too, as mentioned there aren't any checks on how to complete it, but a subquery would be a more direct method of doing it.

ANONYMOUS wrote:

Agree with you. Found that in the end it's requiring lines that do not do filtering, which may not require a subquery to finish indeed. Maybe the description is a bit confusing.