SPARQL Tips: Difference between revisions

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{
{
   ?item rlwdt:P1 rlwd:Q6.
   ?item rlwdt:P1 rlwd:Q6.
SERVICE wikibase:label { bd:serviceParam wikibase:language "en,[AUTO_LANGUAGE]". }
}
</sparql>
== All persons with all properties ==
<sparql tryit="1">
PREFIX rlwd: <https://riga-literata.wikibase.cloud/entity/>
PREFIX rlwdt: <https://riga-literata.wikibase.cloud/prop/direct/>
SELECT ?person ?personLabel ?genderLabel ?birthdate ?birthplaceLabel ?deathdate ?deathplaceLabel ?qid ?viaf ?lnc10
WHERE
{
  ?person rlwdt:P1 rlwd:Q6.
          OPTIONAL { ?person rlwdt:P15 ?gender.}
          OPTIONAL { ?person rlwdt:P18 ?birthdate.}
          OPTIONAL { ?person rlwdt:P20 ?birthplace.}
          OPTIONAL { ?person rlwdt:P19 ?deathdate.}
          OPTIONAL { ?person rlwdt:P21 ?deathplace.}
          OPTIONAL { ?person rlwdt:P6 ?qid.}
          OPTIONAL { ?person rlwdt:P30 ?viaf.}
          OPTIONAL { ?person rlwdt:P4 ?lnc10.}
 
SERVICE wikibase:label { bd:serviceParam wikibase:language "en,[AUTO_LANGUAGE]". }
SERVICE wikibase:label { bd:serviceParam wikibase:language "en,[AUTO_LANGUAGE]". }
}
}

Latest revision as of 14:47, 17 January 2023

Prefixes

in Wikidata prefixes don't need to be specified explicitly in SPARQL queries. However, in our Wikibase.cloud instance, prefixes must be explicitly stated, as this example shows. Please note and mind the distinction between PREFIX kbwdt, kbwd, wdt and wd.

The following query uses these:

PREFIX rlwd: <https://riga-literata.wikibase.cloud/entity/>
PREFIX rlwdt: <https://riga-literata.wikibase.cloud/prop/direct/>

SELECT ?item ?itemLabel
WHERE 
{
  ?item rlwdt:P1 rlwd:Q6.
SERVICE wikibase:label { bd:serviceParam wikibase:language "en,[AUTO_LANGUAGE]". }
}

Try it!


Highlighting and color-coding SPARQL query

ISSUE: the Wikidata SPARQL template for query syntax highlighting is not implemented in this Wikibase.

SOLUTION: Instead one must use a <sparql tryit="1">...</sparql> wrapper, as demonstrated in this example.
Look example above

Exact URL

The exact URL https://kbtestwikibase.wikibase.cloud/wiki/Project:SPARQL/examples, as well as the correct formatting of this page, are important to correctly display these query examples in the query services interface

Retrieved from "https://riga-literata.wikibase.cloud/w/index.php?title=SPARQL_Tips&oldid=327"