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I have a SPARQL query to Wikidata that returns the names and handles and parties of politicians for whom a Mastodon address is stored at Wikidata. Filtered by nationality and with an output of the ...
#2: Nominated for promotion
by
Alexei
·
2024-01-28T12:54:56Z (10 months ago)
#1: Initial revision
by
wasuko
·
2023-12-20T20:56:10Z (11 months ago)
Wikidata: How do I ask for the start date of a property in SPARQL?
I have a SPARQL query to Wikidata that returns the names and handles and parties of politicians for whom a Mastodon address is stored at Wikidata. Filtered by nationality and with an output of the name field in the corresponding language.
I would like to extend this so that the start date (P580) of the Mastodon address (P4033) is output in a field in order to be able to sort the result by new members. Does anyone know how to add the question? `joinedfediverse` should tell the start date.
```
SELECT ?name ?partyLabel ?mastodon ?joinedfediverse
WHERE {
?politician wdt:P31 wd:Q5; # instance of human
wdt:P106 wd:Q82955; # occupation politician
wdt:P27 wd:Q183; # country of citizenship Germany
wdt:P4033 ?mastodon. # Mastodon address
OPTIONAL {?politician wdt:P580 ?joinedfediverse. } # Fediverse joining date
OPTIONAL {?politician wdt:P39 ?position. # position held
?position wdt:P279* wd:Q13217683. # subclass of member of parliament
?position wdt:P1001 ?parliament.} # applies to jurisdiction
OPTIONAL {?politician wdt:P102 ?party.} # member of political party
OPTIONAL {?politician rdfs:label ?name. # name
FILTER(LANG(?name) = "de")} # in German language
SERVICE wikibase:label { bd:serviceParam wikibase:language "de". } # labels in German language
}