Q0.8
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Query
| Query | |
|---|---|
 edit
| |
| id | 8 |
| name | Duplicate URNs |
| title | Duplicate URNs of proceedings |
| description | List all proceedings with duplicate URN ids |
| sparql | # Query 8 of Task 0
# see https://cr.bitplan.com/index.php?title=Q0.8
PREFIX pq: <http://www.wikidata.org/prop/qualifier/>
PREFIX p: <http://www.wikidata.org/prop/>
PREFIX schema: <http://schema.org/>
PREFIX wd: <http://www.wikidata.org/entity/>
PREFIX wdt: <http://www.wikidata.org/prop/direct/>
PREFIX wikibase: <http://wikiba.se/ontology#>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
SELECT ?urn (GROUP_CONCAT(DISTINCT ?proceeding; separator=", ") AS ?proceedings) (COUNT(?proceeding) AS ?count)
WHERE {
# Instance of Proceedings
?proceeding wdt:P31 wd:Q1143604.
# with english label
?proceeding rdfs:label ?proceedingLabel.
FILTER(LANG(?proceedingLabel) = "en")
# Part of the series
?proceeding p:P179 ?partOfTheSeries.
# CEUR Workshop proceedings
?partOfTheSeries ps:P179 wd:Q27230297.
# URN-NBN
OPTIONAL { ?proceeding wdt:P4109 ?urn. }
FILTER(BOUND(?urn)) # Ensure URN is available
}
GROUP BY ?urn
HAVING (COUNT(?proceeding) > 1) # Only select URNs that appear more than once
ORDER BY DESC(?count)
|
| tryiturl | PPiY9f→OLyKEm |
| wdqsurl | 8eX3→8eaz |
| scholia | → |
| relevance | 1 |
| comment | |
| task | Task0→Task0 |