使用Sparql (维基数据)查找美国总统的排名(数量)

SELECT ?president ?rank
WHERE {
  ?president wdt:P31 wd:Q5.
  ?president wdt:P39 wd:Q11696.
  ?president p:P39 ?position.
  ?position ps:P39 wd:Q11696.
  ?position pq:P580 ?start.
  ?position pq:P582 ?end.
  ?position pq:P1545 ?rank.
  FILTER (?start <= "2022-01-01"^^xsd:dateTime && (?end >= "2022-01-01"^^xsd:dateTime || !bound(?end)))
}
ORDER BY ?rank