Rewriting Not In Sub-Select as Join for Propel

Question

Given the following schema:

person:
  id: ~
group:
  id: ~
group_membership:
  person_id: ~
  group_id: ~

I am attempting to find members not w

Answer 1

I think this may be a substitute for the sub-query

SELECT *
FROM person
LEFT OUTER JOIN group_membership
  ON person.id = group_membership.person_id
   AND group_id = 1
WHERE group_membership.person_id is null
;

Rows returned where the person_id is null indicate where rows exist in person but not in group_membership