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An introduction to RDF querying in SPARQL
Zwifi
19.4K views
01
Welcome
02
Initial queries
03
Filters
04
Optionality
05
Negation
06
Alternatives
07
Projection
08
Grouping
09
Modifiers
8/9
Grouping
Previous:
Projection
Next:
Modifiers
Grouping results
Aggregation
Aggregation and projection
count_roles_as.sparql
matrix.ttl
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PREFIX yaco: <https://www.irit.fr/recherches/MELOD
I/ontologies/cinema#>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-synt
ax-ns#>
SELECT ?name (COUNT(?role) AS ?nb_roles)
WHERE {
?actor rdf:type yaco:Actor;
rdfs:label ?name;
yaco:playsRole ?role.
} GROUP BY ?actor
1
@prefix yaco: <https://www.irit.fr/recherches/MELO
DI/ontologies/cinema#> .
Run
Who is he oldest actor?
min_actor.sparql
matrix.ttl
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PREFIX yaco: <https://www.irit.fr/recherches/MELOD
I/ontologies/cinema#>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-synt
ax-ns#>
SELECT ?name (MIN(?year) as ?minYear)
WHERE {
?actor rdf:type yaco:Actor;
rdfs:label ?name;
yaco:birthYear ?year.
}
1
@prefix yaco: <https://www.irit.fr/recherches/MELO
DI/ontologies/cinema#> .
Run
Group filtering
Who are the actors who played in at least two movies?
having_roles.sparql
matrix.ttl
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PREFIX yaco: <https://www.irit.fr/recherches/MELOD
I/ontologies/cinema#>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-synt
ax-ns#>
SELECT ?name
WHERE {
?actor rdf:type yaco:Actor;
rdfs:label ?name;
yaco:playsRole ?role.
} GROUP BY ?actor
HAVING (COUNT(?role) > 2)
1
@prefix yaco: <https://www.irit.fr/recherches/MELO
DI/ontologies/cinema#> .
Run
5
0
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