Difference between revisions of "SPARQL Examples"

From Info216
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         ex:Machine_learning;
 
         ex:Machine_learning;
 
     foaf:name "Sergio_Pastor"^^xsd:string .
 
     foaf:name "Sergio_Pastor"^^xsd:string .
}
+
}
 
        
 
        
 
===Describe Sergio===
 
===Describe Sergio===

Revision as of 08:30, 15 February 2022

This page will be updated with SPARQL examples as the course progresses.


SPARQL Examples from Session 3: SPARQL

Prefixes used

The examples below will assume that these are in place (some examples aren't yet visible).

PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX owl: <http://www.w3.org/2002/07/owl#>
PREFIX dc: <http://purl.org/dc/terms/>
PREFIX bibo: <http://purl.org/ontology/bibo/>
PREFIX foaf: <http://xmlns.com/foaf/0.1/>
PREFIX skos: <http://www.w3.org/2004/02/skos/core#>
PREFIX ss: <http://semanticscholar.org/>
PREFIX kg: <http://i2s.uib.no/kg4news/>
PREFIX sp: <http://i2s.uib.no/kg4news/science-parse/>
PREFIX th: <http://i2s.uib.no/kg4news/theme/>
PREFIX xml: <http://www.w3.org/XML/1998/namespace> 
PREFIX ex: <http://example.org/> 

Select all triplets in graph

SELECT ?s ?p ?o
WHERE {
   ?s ?p ?o .
} 

Select the interestes of Cade

SELECT ?cadeInterest
WHERE {
   ex:Cade ex:interest ?cadeInterest .
} 

Select the country and city where Emma lives

SELECT ?emmaCity ?emmaCountry
WHERE {
   ex:Emma ex:address ?address .
   ?address ex:city ?emmaCity .
   ?address ex:country ?emmaCountry .
} 

Select the people who are over 26 years old

SELECT ?person ?age
WHERE {
   ?person ex:age ?age .
    FILTER(?age > 26) .     
} 

Select people who graduated with Bachelor

SELECT ?person ?degree
WHERE {
   ?person ex:degree ?degree .
   ?degree ex:degreeLevel "Bachelor" .
         
} 

Delete cades photography interest

DELETE DATA
{
   ex:Cade ex:interest ex:Photography .
} 

Delete and insert university of valencia

DELETE { ?s ?p ex:University_of_Valencia }
INSERT { ?s ?p ex:Universidad_de_Valencia }
WHERE  { ?s ?p ex:University_of_Valencia } 

Check if the deletion worked

SELECT ?s ?o2
WHERE  { 
 ?s ex:degree ?o .
 ?o ex:degreeSource ?o2 .
      	}

Insert Sergio

INSERT DATA {
 ex:Sergio a foaf:Person ;
   ex:address [ a ex:Address ;
           ex:city ex:Valenciay ;
           ex:country ex:Spain ;
           ex:postalCode "46021"^^xsd:string ;
           ex:state ex:California ;
           ex:street "4_Carrer_del_Serpis"^^xsd:string ] ;
   ex:degree [ ex:degreeField ex:Computer_science ;
           ex:degreeLevel "Master"^^xsd:string ;
           ex:degreeSource ex:University_of_Valencia ;
           ex:year "2008"^^xsd:gYear ] ;
   ex:expertise ex:Big_data,
       ex:Semantic_technologies,
       ex:Machine_learning;
   foaf:name "Sergio_Pastor"^^xsd:string .
}
     

Describe Sergio

DESCRIBE ex:Sergio ?o
WHERE {
 ex:Sergio ?p ?o .
 ?o ?p2 ?o2 .
 }

Construct that any city is in the country in an address

CONSTRUCT {?city ex:locatedIn ?country}
Where {
 ?s rdf:type ex:Address .
 ?s ex:city ?city .
 ?s ex:country ?country.
 }