DELETE FROM cs USING citation_settings cs INNER JOIN citations c ON (cs.citation_id = c.citation_id) WHERE c.assoc_type <> 257 DELETE FROM cs USING citation_settings cs INNER JOIN citations c ON (cs.citation_id = c.citation_id) WHERE c.assoc_type <> 257 DELETE FROM citation_settings cs USING citations c WHERE c.assoc_type <> 257 AND cs.citation_id = c.citation_id DELETE FROM citations WHERE assoc_type <> 257