Questions tagged [sparql]
SPARQL is a standardized query language for RDF and part of the Semantic Web.
72
questions
2
votes
1
answer
22
views
Wikidata SPARQL query: adding qualifiers?
I have put together this SparQL query that basically get's all the members of UK cabinets.
SELECT ?personLabel ?positionLabel ?parliamentLabel ?startDate ?endDate
WHERE
{
?person wdt:P106 wd:Q82955; ...
- 21
1
vote
1
answer
41
views
Get Wikidata Dump with countries and attributes
I'm trying to write a SPARQL-query for wikidata, returning all European countries with their most recent properties (population, area, average income, age of retirement and human development index). ...
0
votes
1
answer
22
views
Trying to get a qualifier to work, not sure what's wrong
I'm trying to get total assets for companies within the US, but I only want assets from the most recent year available in Wikidata. I'm using P2403 to get total assets and I'm trying to use the ...
- 1
1
vote
2
answers
129
views
Wikidata COUNT(*) query times out
I have a straightforward query that counts how many humans have an English Wikipedia page.
prefix schema: <http://schema.org/>
PREFIX wikibase: <http://wikiba.se/ontology#>
PREFIX wd: <...
- 111
1
vote
0
answers
25
views
getting the latest data about covid-19 pandemic per country with a Wikidata SPARQL query
I'm trying to extract some of the latest data about covid-19 pandemic statistics (number of cases, recoveries, point in time) per country from Wikidata using this SPARQL query:
SELECT DISTINCT ?...
- 11
1
vote
2
answers
62
views
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. ...
- 11
0
votes
1
answer
122
views
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(?...
- 442
2
votes
0
answers
104
views
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 ...
- 121
1
vote
1
answer
84
views
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 ...
- 13
0
votes
1
answer
607
views
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 ...
- 377
1
vote
0
answers
37
views
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/...
1
vote
1
answer
132
views
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
}
?...
- 111
1
vote
2
answers
361
views
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 ...
- 11
1
vote
0
answers
47
views
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 ...
- 21
1
vote
0
answers
66
views
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 ...
- 21
0
votes
0
answers
40
views
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 ...
- 201
1
vote
0
answers
111
views
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) ?...
- 11
2
votes
0
answers
22
views
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 ...
- 121
1
vote
0
answers
40
views
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 ...
- 8,386
1
vote
1
answer
295
views
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/...
- 245
2
votes
1
answer
168
views
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 ...
- 161
1
vote
2
answers
84
views
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 ?...
- 8,386
1
vote
1
answer
775
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 ...
- 121
4
votes
1
answer
67
views
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:/...
- 8,386
1
vote
0
answers
42
views
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:...
- 111
2
votes
0
answers
105
views
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 ...
- 121
2
votes
0
answers
166
views
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. ...
- 121
3
votes
0
answers
41
views
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 ...
- 143
2
votes
0
answers
111
views
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 ...
- 245
1
vote
0
answers
93
views
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=";"...
- 163
1
vote
0
answers
112
views
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....
- 163
3
votes
1
answer
169
views
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 ...
- 163
1
vote
1
answer
89
views
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(?...
- 163
2
votes
1
answer
294
views
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 ?...
- 123
1
vote
1
answer
102
views
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 {
...
- 17.6k
1
vote
1
answer
2k
views
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. ...
- 133
0
votes
1
answer
65
views
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:...
- 171
2
votes
1
answer
333
views
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.
...
- 123
3
votes
0
answers
76
views
(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 ...
- 181
1
vote
1
answer
582
views
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:?...
- 113
2
votes
0
answers
53
views
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 ...
- 123
3
votes
1
answer
544
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 { ...
- 8,386
2
votes
1
answer
236
views
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 {
...
- 155
3
votes
1
answer
138
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 ?...
- 155
5
votes
1
answer
139
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 ...
2
votes
1
answer
139
views
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 ...
- 171
1
vote
1
answer
241
views
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 ...
- 171
2
votes
0
answers
99
views
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( ?...
- 121
2
votes
1
answer
120
views
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 ...
- 8,386
4
votes
1
answer
658
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) ...
- 215