[Wikidata-bugs] [Maniphest] [Closed] T194884: Get a random set of entities from Wikidata

Mon, 02 Jul 2018 14:52:26 -0700

abian closed this task as "Resolved".
abian claimed this task.
abian added a comment.

This query...

SELECT ?s WHERE { ?s wdt:P31 ?o } LIMIT 200


... gives us the following distribution of QIDs...



F23242279: non-random.png



... while this query...



SELECT ?s WHERE {
  SERVICE bd:sample {
    ?s wdt:P31 ?o .
    bd:serviceParam bd:sample.limit 200 .
    bd:serviceParam bd:sample.sampleType "RANDOM" .
  }
}



... gives us the following distribution of QIDs. <3



F23242256: random.png



This is great, @Smalyshev! We could prepare an example query so that people can see this trick (and so that we don't forget it). :-)

TASK DETAIL
https://phabricator.wikimedia.org/T194884

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To: abian
Cc: Smalyshev, Aklapper, abian, Lahi, Gq86, Darkminds3113, Lucas_Werkmeister_WMDE, GoranSMilovanovic, QZanden, EBjune, merbst, LawExplorer, Avner, Gehel, Jonas, FloNight, Xmlizer, jkroll, Wikidata-bugs, Jdouglas, aude, Tobias1984, Manybubbles, Mbch331
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