Employers: discover CodinGame for tech hiring
EVENTS
UPCOMING
PAST
SOLO
PUZZLES
CODE GOLF
OPTIMIZATION
MULTI
LEADERBOARDS
CLASH OF CODE
BOT PROGRAMMING
CODING ESCAPE
COMMUNITY
CONTRIBUTIONS
LEARN
DISCORD
FORUM
LIVE STREAMS
BLOG
Log In
Sign Up
An introduction to RDF querying in SPARQL
Zwifi
20.8K 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
1
2
3
4
5
6
7
8
9
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
1
2
3
4
5
6
7
8
9
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
1
2
3
4
5
6
7
8
9
10
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
Create your playground on Tech.io
This playground was created on Tech.io, our hands-on, knowledge-sharing platform for developers.
Go to tech.io
Suggested playgrounds
Common patterns with Solid
By
Zwifi
5,097
2
0
Learning algorithmics with Ada
By
Zwifi
17.5K
4
0
Learn Python with 'de Developer'
By
deDeveloper
3,484
32
0
Exercice Javascript
By
StevenHanse
17.6K
246
0
ABOUT US
CAREERS
PRIVACY
FAQ
The #1 tech hiring platform
SCREENING
INTERVIEWING
ABOUT US
CAREERS
PRIVACY
FAQ
Facebook
YouTube
Twitter
LinkedIn
FR
EN
