Sparql Wikidata按项查询标识
我想通过项目标识符查询给定城市的翻译。 对于本次查询,karlsruhe的if上的属性p31 这是我的问题Sparql Wikidata按项查询标识,sparql,wikidata,Sparql,Wikidata,我想通过项目标识符查询给定城市的翻译。 对于本次查询,karlsruhe的if上的属性p31 这是我的问题 SELECT DISTINCT ?city ?label ?population WHERE { ?city (wdt:P31/wdt:P279*) wd:Q515. // is city ?city wdt:P31 wd:Q1040. //is karlsruhe ?city wdt:P1082 ?population. ?city rdfs:label ?label.
SELECT DISTINCT ?city ?label ?population WHERE {
?city (wdt:P31/wdt:P279*) wd:Q515. // is city
?city wdt:P31 wd:Q1040. //is karlsruhe
?city wdt:P1082 ?population.
?city rdfs:label ?label.
FILTER(((LANG(?label)) = "de") || ((LANG(?label)) = "en") || ((LANG(?label)) = "it") || ((LANG(?label)) = "ru") || ((LANG(?label)) = "ro") || ((LANG(?label)) = "tr") || ((LANG(?label)) = "pl") || ((LANG(?label)) = "fr") || ((LANG(?label)) = "es") || ((LANG(?label)) = "hr"))
}
但我没有得到任何结果
我做错了什么?简而言之,问题是卡尔斯鲁厄不是卡尔斯鲁厄。请仔细阅读的定义 您的查询应该是:
SELECT DISTINCT ?city ?label ?population WHERE {
VALUES (?city) { (wd:Q1040) } # is Karlsruhe
?city (wdt:P31/wdt:P279*) wd:Q515 # is a city
OPTIONAL { ?city wdt:P1082 ?population }
?city rdfs:label ?label
FILTER(LANG(?label) IN ("de", "en", "it", "ru", "ro", "tr", "pl", "fr", "es", "hr"))
}
为了更好地理解,可以用以下方式重写上面的查询:
SELECT DISTINCT ?city ?label ?population WHERE {
FILTER(?city IN (wd:Q1040)) # is Karlsruhe
?city (wdt:P31/wdt:P279*) wd:Q515 # is a city
OPTIONAL { ?city wdt:P1082 ?population }
?city rdfs:label ?label
FILTER(LANG(?label) IN ("de", "en", "it", "ru", "ro", "tr", "pl", "fr", "es", "hr"))
}
在RDFS++蕴涵下,人们甚至会写:
SELECT DISTINCT ?city ?label ?population WHERE {
?city owl:sameAs wd:Q1040 # is Karlsruhe
?city wdt:P31 wd:Q515 # is a city
OPTIONAL { ?city wdt:P1082 ?population }
?city rdfs:label ?label
FILTER(LANG(?label) IN ("de", "en", "it", "ru", "ro", "tr", "pl", "fr", "es", "hr"))
}
简言之,问题在于卡尔斯鲁厄不是卡尔斯鲁厄。请仔细阅读的定义 您的查询应该是:
SELECT DISTINCT ?city ?label ?population WHERE {
VALUES (?city) { (wd:Q1040) } # is Karlsruhe
?city (wdt:P31/wdt:P279*) wd:Q515 # is a city
OPTIONAL { ?city wdt:P1082 ?population }
?city rdfs:label ?label
FILTER(LANG(?label) IN ("de", "en", "it", "ru", "ro", "tr", "pl", "fr", "es", "hr"))
}
为了更好地理解,可以用以下方式重写上面的查询:
SELECT DISTINCT ?city ?label ?population WHERE {
FILTER(?city IN (wd:Q1040)) # is Karlsruhe
?city (wdt:P31/wdt:P279*) wd:Q515 # is a city
OPTIONAL { ?city wdt:P1082 ?population }
?city rdfs:label ?label
FILTER(LANG(?label) IN ("de", "en", "it", "ru", "ro", "tr", "pl", "fr", "es", "hr"))
}
在RDFS++蕴涵下,人们甚至会写:
SELECT DISTINCT ?city ?label ?population WHERE {
?city owl:sameAs wd:Q1040 # is Karlsruhe
?city wdt:P31 wd:Q515 # is a city
OPTIONAL { ?city wdt:P1082 ?population }
?city rdfs:label ?label
FILTER(LANG(?label) IN ("de", "en", "it", "ru", "ro", "tr", "pl", "fr", "es", "hr"))
}