Question

我是SPARQL的新手，并且一直在试验我的数据。我已经尝试过以下查询：

PREFIX dcterms: <http://purl.org/dc/terms/>
PREFIX locah: <http://data.archiveshub.ac.uk/def/>
PREFIX foaf: <http://xmlns.com/foaf/0.1/>
PREFIX ore: <http://www.openarchives.org/ore/terms/>
SELECT ?language ?date ?authorName ?authorSurname ?associatedDeeds ?repository
WHERE{
  ?x dcterms:identifier "R494Vol1".
  ?x locah:dateCreatedAccumulatedString ?date.
  ?x dcterms:language ?language.
  ?x dcterms:creator ?y.
  ?y foaf:firstName ?authorName.
  ?y foaf:family_name ?authorSurname.
  ?x locah:accessProvidedBy ?repository.
  ?x ore:aggregates ?associatedDeeds.
}

这将返回多个记录。但是language，date，authorName，authorSurname和repository都是相同的。唯一更改的值为associatedDeeds。能否获得包含associatedDeeds列表的1条记录？

更新：

我尝试了group_concat，它可以正常工作。但是，由于?associatedDeeds是资源，这些资源将被转换为文字-字符串。有没有办法保留URI链接？

PREFIX dcterms: <http://purl.org/dc/terms/>
PREFIX locah: <http://data.archiveshub.ac.uk/def/>
PREFIX foaf: <http://xmlns.com/foaf/0.1/>
PREFIX ore: <http://www.openarchives.org/ore/terms/>
SELECT ?language ?date ?authorName ?authorSurname ?repository (group_concat(?associatedDeeds) as ?deeds)
WHERE{
   ?x dcterms:identifier "MS588".
   ?x locah:dateCreatedAccumulatedString ?date.
   ?x dcterms:language ?language.
   ?x dcterms:creator ?y.
   ?y foaf:firstName ?authorName.
   ?y foaf:family_name ?authorSurname.
   ?x locah:accessProvidedBy ?repository.
   ?x ore:aggregates ?associatedDeeds.
}
 group by ?language ?date ?authorName ?authorSurname ?repository

汇总结果获得1条记录

0 个答案: