如何在另一个sparql查询中进行sparql查询?
我试图在另一个sparql查询中进行sparql查询。在sql中,我们可以这样做:如何在另一个sparql查询中进行sparql查询?,sparql,Sparql,我试图在另一个sparql查询中进行sparql查询。在sql中,我们可以这样做: SELECT column_name(s) FROM table_name WHERE column_name IN (SELECT STATEMENT); SELECT ?Subsidiary ?SubsidiaryLabel ?parent_organization ?parent_organizationLabel WHERE { SERVICE wikibase:label { bd:ser
SELECT column_name(s)
FROM table_name
WHERE column_name IN (SELECT STATEMENT);
SELECT ?Subsidiary ?SubsidiaryLabel ?parent_organization ?parent_organizationLabel WHERE {
SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en". }
?Subsidiary wdt:P749 wd:
{SELECT DISTINCT ?item ?label ?articleLabel WHERE {
?item ?label "Siemens PLM Software"@en;
wdt:P31 wd:Q4830453.
?article schema:about ?item;
schema:inLanguage "en".
SERVICE wikibase:label { bd:serviceParam wikibase:language "en". }
}
}.
OPTIONAL { ?Subsidiary wdt:P749 ?parent_organization. }
我想在SPARQL查询中做同样的事情。具体来说,我有两个sparql查询,我想将它们组合在一起。我的最终目标是找到西门子PLM软件公司的子公司。为了做到这一点,首先我需要找到该公司的id,然后寻找其子公司
Q1:找到“西门子PLM软件公司”的唯一标识
SELECT DISTINCT ?item ?label ?articleLabel WHERE {
?item ?label "Siemens PLM Software"@en;
wdt:P31 wd:Q4830453.
?article schema:about ?item;
schema:inLanguage "en".
SERVICE wikibase:label { bd:serviceParam wikibase:language "en". }
}
SELECT ?Subsidiary ?SubsidiaryLabel ?parent_organization ?parent_organizationLabel WHERE {
SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en". }
?Subsidiary wdt:P749 wd:Q15898201.
OPTIONAL { ?Subsidiary wdt:P749 ?parent_organization. }
- 返回Q15898201
SELECT DISTINCT ?item ?label ?articleLabel WHERE {
?item ?label "Siemens PLM Software"@en;
wdt:P31 wd:Q4830453.
?article schema:about ?item;
schema:inLanguage "en".
SERVICE wikibase:label { bd:serviceParam wikibase:language "en". }
}
SELECT ?Subsidiary ?SubsidiaryLabel ?parent_organization ?parent_organizationLabel WHERE {
SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en". }
?Subsidiary wdt:P749 wd:Q15898201.
OPTIONAL { ?Subsidiary wdt:P749 ?parent_organization. }
- 返回西门子
SELECT column_name(s)
FROM table_name
WHERE column_name IN (SELECT STATEMENT);
SELECT ?Subsidiary ?SubsidiaryLabel ?parent_organization ?parent_organizationLabel WHERE {
SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en". }
?Subsidiary wdt:P749 wd:
{SELECT DISTINCT ?item ?label ?articleLabel WHERE {
?item ?label "Siemens PLM Software"@en;
wdt:P31 wd:Q4830453.
?article schema:about ?item;
schema:inLanguage "en".
SERVICE wikibase:label { bd:serviceParam wikibase:language "en". }
}
}.
OPTIONAL { ?Subsidiary wdt:P749 ?parent_organization. }
你知道我怎么做吗?谢谢大家! 有几件事不太清楚:
- 您真的想将
属性返回为rdfs:label
?我不明白您为什么要这样做,所以我假设您的意思是直接匹配?label
属性而不返回它rdfs:label
- 为什么返回
?无论如何,它不是一个真正的标签,只是?articleLabel
作为一个文本的值。我想你的意思是只返回?label
?文章
- 看来你的上级组织关系倒过来了?您的第二季度需要西门子PLM软件的子公司。没有。要请求西门子,您需要请求
而不是wd:Q15898201 wdt:P749 ?parent_organization
?Subsidiary wdt:P749 wd:Q15898201
可选
,并确保变量名称在整个查询过程中正确匹配,即可实现查询:
SELECT ?item ?itemLabel ?parent_organization ?parent_organizationLabel WHERE {
# Find business by label
?item rdfs:label "Siemens PLM Software"@en;
wdt:P31 wd:Q4830453.
# Find English-language articles about the business
?article schema:about ?item;
schema:inLanguage "en".
# Find the business' parent organization, if one exists
OPTIONAL { ?item wdt:P749 ?parent_organization. }
# For any variable ?xxx, add variable ?xxxLabel with the label
SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en". }
}
也就是说,如果您确实想:
SELECT ?item ?itemLabel ?parent_organization ?parent_organizationLabel WHERE {
{
SELECT ?item {
?item rdfs:label "Siemens PLM Software"@en;
wdt:P31 wd:Q4830453.
}
}
?article schema:about ?item;
schema:inLanguage "en".
OPTIONAL { ?item wdt:P749 ?parent_organization. }
SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en". }
}
这相当于第一个查询,但运行速度要慢得多,因为查询优化程序不太擅长处理子查询。我不明白为什么要使用子查询?为什么不合并两个查询的三重模式呢?我的意思是,最终它将是一个连接,这里不需要更多。这里不需要子查询,我使用了@cygri的答案,它可以工作!非常感谢您的帮助,我是sparql的新手,仍在努力了解它是如何工作的。这对我来说真的很有用。