query: SELECT organization_id FROM organizations EXCEPT SELECT parent_organization_id FROM organizations
question: Which organizations are not parent organizations of others? Are Listing organizations id.
query_toks: SELECT organization_id FROM organizations EXCEPT SELECT parent_organization_id FROM organizations
query_toks_no_value: select organization_id from organizations except select parent_organization_id from organizations
question_toks: Which organizations are not parent organizations of others? Are Listing organizations id.