Questions tagged [sparql]

SPARQL is a standardized query language for RDF and part of the Semantic Web.

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Fail to search a wikidata item through SPARQL

I tried to search and get the ID of a item with a certain label: Teodor Bogdanov. I can search this name successfully through wikidata website. However, I failed to do so by searching through SPARQL. ...
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Wikidata entities from wikidata toolkit

I am wondering how can i get all the information about Douglas Adams or any other entity of Wikidata using the wikidata toolkit. I have download the wikidata toolkit example from this link https://...
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Find random 10 people Wikidata

Using Sparql I can find person on Wikdata by his name: SELECT distinct (SAMPLE(?image)as ?image) ?item ?itemLabel ?itemDescription (SAMPLE(?DR) as ?DR)(SAMPLE(?RIP) as ?RIP)(SAMPLE(?...
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WikiData: filter mwapi results

I am trying to write a sparql query that can retrieve all categories/items from a root and filter down only the ones that are of "human" type. Using the query below, I can retrieve all ...
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Wikidata reconciliation with OpenRefine—get only those subjects with English as the language flag

Leptospermum scoparium (Q1520028) has 8 common name (P1843) entries. I have data in OpenRefine reconciled to this object: How can I get only those P1843 entries that are in English? The ...
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Sparql Qualifiers

i am trying to extract some information from wikidata. I want to show the current version and its corresponding operating system and publishing date for Applications (for example microsoft teams). My ...
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How to get person name and other attributes from Wikidata Sparql (resolving entities)?

I have this Node.js sparql fetcher from Wikidata: next() async function next(offset = 0) { const sparql = ` SELECT ?person ?pic ?givenName ?familyName ?placeOfBirth WHERE { ?person wdt:P31 ...
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Explanation for behaviour of FILTER in WDQS

I try to write a simple SPARQL query using WDQS to show some information about a city. My first attempt was to filter using a check for equality, like: SELECT ?city ?cityLabel WHERE { ?city wdt:P31/...
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SPARQL query to find invalid date in Wikidata

The following wikidata query lists the teams Cristiano Ronaldo played for including start and end dates. SELECT ?playerLabel ?teamLabel ?start ?end WHERE { VALUES ?player { wd:Q11571 } ?...
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Where can I find databases in .rdf or in .ttl format

I have to make web application with rdf and sparql and I need database in rdf/xml or in ttl format but I can not find. I thought about music or movies or books database but I did'nt find if you know ...
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DOID , SYMP Ontology Sparql Queries

I need to extract the list of diseases, categories, bodyparts and symptoms. I've found several ontologies for that datasets. Disease ontology, symptom ontology, Bioportal and Wikipedia. But I don't ...
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How to get List of all diseases , categories , causes and symptoms?

I am looking for a medical dataset. I Need a list of all diseases, symptoms, categories, causes, body part relations. I don't know how to get it. Actually I've found some semantic sources like DO ...
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How to retrieve infos about creators with sparql in wikidata

I'm trying to retrieve infos about birth and death corresponding to paintors with this query, however I have an empty result if I uncomment birth and death infos. # added before 2016-10 # Recherche de ...
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How can I override this «Query is malformed: Bad aggregate» error message?

I'm working with a Wikidata query: SELECT DISTINCT ?protected_area ?protected_areaLabel ?coordinate_location ?territorialEntity ?territorialEntityLabel (SAMPLE(?instance_of) AS ?instance_of) ?...
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Workflow to backup SPARQL Endpoint to Git repository?

We want to provide version control to a small sized Virtuoso SPARQL endpoint but the workflow we use is quite cumbersome and always generates huge diffs for blank nodes because they get new IDs every ...
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SPARQL to get Wikidata items that have no P18 image but have a Commons image depicting them?

Many Commons images depict Wikidata concepts. How to find these concepts, in particular those that do not have an image (P18) property? The request should output the URIs of both the Wikidata item ...
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How to get the path details between two nodes in DBpedia in SPARQL

I want to check if two DBpedia nodes have a path using; dct:subject and skos:broader properties without specifying properties For instance consider the two DBpedia nodes http://dbpedia.org/resource/...
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Does Wikidata offer inferencing/reasoning?

I would like to use RDFS level inferencing in some queries posed in the Wikidata Query Service which uses SPARQL. Does it support inferencing/reasoning? If so, in what kind? For example, is it Forward ...
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Find all Wikidata items whose image (P18) URL contains a certain word

I am trying to find all Wikidata items whose P18 property is an URL that has the word "Montage" anywhere in its filename. Example: I managed to find items by their complete P18 filename: SELECT ?...
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1 answer
488 views

SPARQL get all the data before it reaches timeout

I am trying to get all the city names of all countries in the world using this below query. Whenever I execute this below query it returns this message "Query timeout limit reached". Is there any ...
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Find most-depicted Wikidata items that have no image

Wikimedia Commons has a new feature where a picture can have metadata saying it depicts a given Wikidata item. For instance, https://commons.wikimedia.org/wiki/File:Grandpark_Plaza.jpg depicts https:/...
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How come there are missing entities in this SPARQL query?

I was interested in listing all books, so I wrote: SELECT ?book ?url WHERE { ?book wdt:P31 wd:Q571 . OPTIONAL { ?url schema:about ?book . ?url schema:inLanguage "en" . ?url schema:...
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SPARQL - Filter wikidata identifiers

Query below gives me all programming languages entities, with their statements. Problem is that I don't need identifiers now, but these IDs might become necessary. I was just gonna model database ...
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Wikidata SPARQL - get company entities and the location of their headquarters

I'm having trouble extracting location attributes of company HQ's. My query: finds all companies or sub-classes, and returns some basic properties such as ISIN and URL, and the Headquarter location. ...
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SPARQL query to get capacity of event venues from Wikidata

I am trying to query Wikidata to find out the capacities of all event venues in specific geographic regions (US urban centers). They have this service for querying: Wikidata Query Service The answer ...
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How to use wikidata property paths?

Given a term/concept, I want to decide if it belongs to computer science. For that, I am checking if the concept has a property path to computer science node. In other words, I am checking whether ...
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Wikidata SPARQL How to speed up this query?

I have come to this query, which retrieves wikipedia and wikidata info from a wikipedia title: SELECT ?wikipediaId ?wikipediaTitle ?wikidataId ?desc ?imageUrl (GROUP_CONCAT(?instanceOfS; SEPARATOR=";"...
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Wikidata Sparql Getting properties from a Wikipedia generator list

I am trying to get the properties that the linked pages from a wikipedia page have. SELECT ?item ?wikipediaTitle ?target WHERE { SERVICE wikibase:mwapi { bd:serviceParam wikibase:endpoint "en....
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1 answer
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Wikidata Query: How to retrieve the normal (non-verbose) JSON?

We can download the results of a Wikidata Query as "JSON file" or "JSON file (verbose)" Example link of random query: http://w.wiki/WQ. I am developing a javascript software which retrieves some ...
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Wikidata SPARQL get current VALUES index

I have the current SPARQL code: SELECT ?currentQid ?propQid ?targetQid WHERE { VALUES ?current {wd:Q5 wd:Q6 wd:Q7 wd:Q8 wd:Q9} VALUES ?prop {wdt:P31 wdt:P279 wdt:P361} BIND (STRAFTER(STR(?...
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2 votes
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Wikidata SPARQL with optional qualifiers

I am trying to adapt the Mona Lisa exercise in the Wikidata SPARQL tutorial so it will show all the materials used and where they apply. If I simply do: SELECT ?painting ?paintingLabel ?material ?...
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1 answer
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Expand Wikidata SPARQL query to self-join

I have this query to get the population of cities and the country they belong to: SELECT ?city (?population as ?city_pop) ?country ?countryLabel ?continent ?continentLabel ?cityLabel WHERE { ...
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How to output only English labels in SPARQL query?

I don't understand why this SPARQL queries produce duplicates: SELECT DISTINCT ?WikidataItem ?itemLabel WHERE { ?WikidataItem rdfs:label ?itemLabel. ?WikidataItem ?label "Mozilla Firefox"@en. ...
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Wikidata - Filter or Detect or Get incomplete date

I've the following query PREFIX xsd: <http://www.w3.org/2001/XMLSchema#> SELECT ?item ?itemLabel ?dod ?dob WHERE { ?item wdt:P570 ?dod. ?item wdt:P31 wd:Q5. SERVICE wikibase:label { bd:...
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2 votes
1 answer
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Limiting a SPARQL Query to Lastest Point in Time

I'm trying to get information on Prefectures in Japan out of Wikidata. I succeeded to read the population statement, however there are occasionally several values with different point in time fields. ...
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(How) Was SPARQL influenced by erotetics?

Erotetics is the logic of questions and answers. The field has been developed over the last hundred years and is nicely summarized by (Wisniewski 2015). How, if at all, was SPARQL, the RDF query ...
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Get list of all wikidata properties used to link to an item

The first part of my question is, is there a SPARQL equivalent of the "What links here" link? E.g. as described at https://opendata.stackexchange.com/a/5271/20321 I tried: WHERE { ?item wdt:?...
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2 votes
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Querying Sparql dataset and caching results locally

During querying LOD datasets (using Sparql queries), we could face connection or server problems. Is there a reliable strategy that helps us to get data is a reliable way ? I'm looking for a tool (in ...
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3 votes
1 answer
358 views

Numerically order SPARQL results that are external identifiers but actually all numbers

I wrote this query to list Wikidata items that have an RFC identifier: SELECT ?rfcId ?itemLabel ?classLabel ?item WHERE { ?item wdt:P31 ?class. ?item wdt:P892 ?rfcId. SERVICE wikibase:label { ...
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2 votes
1 answer
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How can I query Wikidata for a label and optional image without further constraints?

I made a derivation of the cats with images example where I query for a specific cat, in particular its label and a possible image (in the web interface): SELECT ?item ?itemLabel ?pic WHERE { ...
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3 votes
1 answer
117 views

Why does Wikidata's query interface return no results for entities with an id of Q10000001 or higher?

I have this SPARQL query to return an item's label and the url of a Wikipedia article: PREFIX schema: <http://schema.org/> PREFIX wd: <http://www.wikidata.org/entity/> SELECT ?article ?...
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5 votes
1 answer
122 views

Julian and Gregorian dates from Wikidata

How can I get the Julian birth or death date for someone who was born or died under the Julian Calendar (Isaac Newton, for example) on Wikidata using a SPARQL query? This simple query returns "4 ...
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1 vote
1 answer
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Search in wikidata with specific Q code

I've this query but I can't understand why doesn't return any result. I try different versions (with link, with only code, with wd:code) but nothing seems to work. What I need is this query but ...
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1 vote
1 answer
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Weird results in search from wikidata

I ve this query, which i want to find every instance of human with name Jose (already a first name like John, very common) in wikidata spanish, and then I get only 10 results. I believe is the way of ...
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2 votes
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Property and sub-property pairs

Here are some example records: https://www.wikidata.org/wiki/Q11361734 https://www.wikidata.org/wiki/Q74669 I have the following (updated) query: # Script #2 SELECT (GROUP_CONCAT( ?...
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2 votes
1 answer
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Find all Wikidata items that use a particular P18 picture

I want to find all Wikidata items that have "Gthumb.svg" as a P18 property. Leaving aside the fact that "Gthumb.svg" may not exist on Commons and that normal P18 values have a "commons:" prefix, it ...
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3 votes
1 answer
468 views

Most efficient way to get the Wikidata entity for a city, given as a string

The goal is to get from the string "Lugano", the entity Q7024, knowing that I am searching for Swiss locations, by name in German. So far this is how I do it but it doesn't look very efficient. 1) ...
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3 votes
1 answer
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Sort results by proximity with the "around" service in Wikidata

With this query, I can get a list of German cities around Berlin, within a radius of 50 km. SELECT ?place ?placeLabel ?location WHERE { wd:Q64 wdt:P625 ?arcLoc . ?place wdt:P31 wd:Q515 . ?...
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2 votes
1 answer
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Wikidata - How to get a table with all US cities with associated counties?

I did not find existing data of good quality that I can use directly. I thought that Wikidata was the best source to use and that it would be an opportunity to learn how to extract from this data ...
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7 votes
2 answers
94 views

SPARQL federation and attribution licenses?

Many public datasets are published under licenses that require attribution, such as CC-BY. If I have a public SPARQL endpoint, and allow federated queries to access data from such endpoint, that means ...
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