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我一直在研究SPARQL查询以在图形存储中查找唯一值组合。但我没有成功。SPARQL计数唯一值组合
基本上我尝试做的是:
a b c
e f g
e r t
a b c
k l m
e f g
a b c
result:
a b c | 3
e f g | 2
e r t | 1
k l m | 1
试过几种结构,与distincts,组by`s和子查询,但我不取得成功。
最后一次尝试:
SELECT (count (*) as ?n){
SELECT DISTINCT ?value1 ?value2 ?value3 WHERE {
?instance vocab:relate ?value1 .
?instance vocab:relate ?value2 .
?instance vocab:relate ?value3 .
}
}
RDF:你需要一个排序标准添加到值,这样你不考虑所有不同的可能的方式:
<http://test.example.com/instance1>
a <http://test.example.com#Instance> ;
<http://vocab.example.com/relate>
<http://test.example.com/c> , <http://test.example.com/b> , <http://test.example.com/a> .
<http://test.example.com/instance6>
a <http://test.example.com#Instance> ;
<http://vocab.example.com/relate>
<http://test.example.com/g> , <http://test.example.com/f> , <http://test.example.com/e> .
<http://test.example.com/instance4>
a <http://test.example.com#Instance> ;
<http://vocab.example.com/relate>
<http://test.example.com/c> , <http://test.example.com/b> , <http://test.example.com/a> .
<http://test.example.com/instance2>
a <http://test.example.com#Instance> ;
<http://vocab.example.com/relate>
<http://test.example.com/g> , <http://test.example.com/f> , <http://test.example.com/e> .
<http://test.example.com/instance7>
a <http://test.example.com#Instance> ;
<http://vocab.example.com/relate>
<http://test.example.com/c> , <http://test.example.com/b> , <http://test.example.com/a> .
<http://test.example.com/instance5>
a <http://test.example.com#Instance> ;
<http://vocab.example.com/relate>
<http://test.example.com/m> , <http://test.example.com/l> , <http://test.example.com/k> .
<http://test.example.com/instance3>
a <http://test.example.com#Instance> ;
<http://vocab.example.com/relate>
<http://test.example.com/t> , <http://test.example.com/r> , <http://test.example.com/e> .
我猜你只需要一个'FILTER(?值1 <值2 &&值2 <值3)',但我无法测试它,你没有告诉我们的RDF(样本)数据 – AKSW
增加了RDF到最初的帖子 – user3599600