SPARQL Playground (RDF Playground)

This interactive tool allows you to experiment with running SPARQL queries against RDF datasets. You can use SPARQL federation to effectively join in the data from external SPARQL endpoints.

RDF data (Turtle)

@prefix ex: <http://example.org/> .
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix wd: <http://www.wikidata.org/entity/> .

# Alice knows Bob and Carol
ex:Alice foaf:knows ex:Bob , ex:Carol .

# Bob watched The Terminator, The Matrix, and Back to the Future
ex:Bob ex:watched wd:Q162255 , wd:Q83495 , wd:Q91540 .

# Carol watched The Lion King
ex:Carol ex:watched wd:Q36479 .1
@prefix ex: <http://example.org/> .
2
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
3
@prefix wd: <http://www.wikidata.org/entity/> .
4

5
# Alice knows Bob and Carol
6
ex:Alice foaf:knows ex:Bob , ex:Carol .
7

8
# Bob watched The Terminator, The Matrix, and Back to the Future
9
ex:Bob ex:watched wd:Q162255 , wd:Q83495 , wd:Q91540 .
10

11
# Carol watched The Lion King
12
ex:Carol ex:watched wd:Q36479 .

The RDF dataset to query.

SPARQL query

PREFIX ex: <http://example.org/>
PREFIX foaf: <http://xmlns.com/foaf/0.1/>
PREFIX wd: <http://www.wikidata.org/entity/>
PREFIX wdt: <http://www.wikidata.org/prop/direct/>

# Does Alice know anyone who has watched an Arnold Schwarzenegger movie?
SELECT ?person ?movie
WHERE {
  ex:Alice foaf:knows ?person .
  ?person ex:watched ?movie .
  SERVICE <https://query.wikidata.org/sparql> {
    ?movie wdt:P161 wd:Q2685 . # cast member = Arnold Schwarzenegger
  }
}1
PREFIX ex: <http://example.org/>
2
PREFIX foaf: <http://xmlns.com/foaf/0.1/>
3
PREFIX wd: <http://www.wikidata.org/entity/>
4
PREFIX wdt: <http://www.wikidata.org/prop/direct/>
5

6
# Does Alice know anyone who has watched an Arnold Schwarzenegger movie?
7
SELECT ?person ?movie
8
WHERE {
9
  ex:Alice foaf:knows ?person .
10
  ?person ex:watched ?movie .
11
  SERVICE <https://query.wikidata.org/sparql> {
12
    ?movie wdt:P161 wd:Q2685 . # cast member = Arnold Schwarzenegger
13
  }
14
}

The SPARQL query to execute.

Query result

Press the Run query button to execute the query.

What are SPARQL and RDF?

The Resource Description Framework (RDF) is a format for structured data that uses triples to represent information. A set of RDF triples, a.k.a. an RDF dataset, can be stored in a database or file and queried using the SPARQL query language (similar to how SQL works for relational databases).

What is SPARQL federation?

Federation is one of the key features of SPARQL that allows you to extend your queries to external data sources on the web and combine the results with your local data. This is done using the SERVICE keyword in SPARQL queries.

Here's a simple example of a federated query that retrieves additional data from an external endpoint:

PREFIX ex: <http://example.org/>
PREFIX foaf: <http://xmlns.com/foaf/0.1/>

SELECT ?friend ?friendOfFriend
WHERE {
  ex:Alice foaf:knows ?friend .

  SERVICE <http://thirdparty.org/sparql> {
    ?friend foaf:knows ?friendOfFriend .
  }
}