text: Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
  ### Context:
  CREATE TABLE organizations (organization_id VARCHAR, parent_organization_id VARCHAR)
  ### Question:
  Which organizations are not a parent organization of others? List the organization id.
  ### Answer:
  SELECT organization_id FROM organizations EXCEPT SELECT parent_organization_id FROM organizations