Difference between revisions of "Help:SPARQL"
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(Created page with "SPARQL is the query language used by the [http://query.personaldata.io query service]. You can read more about SPARQL [https://www.wikidata.org/wiki/Wikidata:SPARQL_query_ser...") |
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* a description of the different [https://www.wikidata.org/wiki/Wikidata:SPARQL_query_service/Wikidata_Query_Help/Result_Views views on results] that are possible; note that each view expects the data to arrive for each row in a specific order as a tuple, even bound to a variable of fixed name | * a description of the different [https://www.wikidata.org/wiki/Wikidata:SPARQL_query_service/Wikidata_Query_Help/Result_Views views on results] that are possible; note that each view expects the data to arrive for each row in a specific order as a tuple, even bound to a variable of fixed name | ||
* [https://www.wikidata.org/wiki/Wikidata:SPARQL_query_service/A_gentle_introduction_to_the_Wikidata_Query_Service a gentle introduction to the Wikidata Query Service] | * [https://www.wikidata.org/wiki/Wikidata:SPARQL_query_service/A_gentle_introduction_to_the_Wikidata_Query_Service a gentle introduction to the Wikidata Query Service] | ||
| + | |||
| + | == Specifics here == | ||
| + | On this site, it is customary to use some prefixes: | ||
| + | |||
| + | {{#tag:syntaxhighlight|PREFIX pdio: <https://wiki.personaldata.io/entity/> | ||
| + | PREFIX pdiot: <https://wiki.personaldata.io/prop/direct/> | ||
| + | PREFIX pdiop: <https://wiki.personaldata.io/prop/> | ||
| + | PREFIX pdiops: <https://wiki.personaldata.io/prop/statement/> | ||
| + | PREFIX pdiopq: <https://wiki.personaldata.io/prop/qualifier/>|lang="sparql"}} | ||
| + | |||
| + | This replicates the same [https://www.mediawiki.org/wiki/Wikibase/Indexing/RDF_Dump_Format#Prefixes_used prefix scheme for Wikidata] (see also [https://www.mediawiki.org/wiki/Wikidata_Query_Service/User_Manual#Basics_-_Understanding_Prefixes here]). | ||
| + | |||
| + | == Example queries here == | ||
| + | |||
| + | Many queries on this site use the template [https://wiki.personaldata.io/w/index.php?title=Template:SPARQL&action=edit Template:SPARQL]. | ||
| + | You can therefore find these examples by looking for the [[Special:WhatLinksHere/Template:SPARQL|pages pointing to that exact template]]. | ||
| + | |||
| + | [[Category:Help]] | ||
Latest revision as of 20:35, 20 January 2020
SPARQL is the query language used by the query service.
You can read more about SPARQL here, on Wikidata. This has different parts:
- tutorial
- Building a Query examples
- very very very many examples on Wikidata -- this is the best way to learn, at least for me
- Wikidata Query Service user manual, which includes an explication of the 'label' service
- a description of the different views on results that are possible; note that each view expects the data to arrive for each row in a specific order as a tuple, even bound to a variable of fixed name
- a gentle introduction to the Wikidata Query Service
Specifics here
On this site, it is customary to use some prefixes:
PREFIX pdio: <https://wiki.personaldata.io/entity/>
PREFIX pdiot: <https://wiki.personaldata.io/prop/direct/>
PREFIX pdiop: <https://wiki.personaldata.io/prop/>
PREFIX pdiops: <https://wiki.personaldata.io/prop/statement/>
PREFIX pdiopq: <https://wiki.personaldata.io/prop/qualifier/>
This replicates the same prefix scheme for Wikidata (see also here).
Example queries here
Many queries on this site use the template Template:SPARQL. You can therefore find these examples by looking for the pages pointing to that exact template.