Hi, labels in Wikidata are multilingual and are mapped to RDF literals with a language tag. This query finds three results (though only one of them has a date of birth):
SELECT ?_Geburtsdatum WHERE {
?s ?label "Brian O'Nolan"@en.
OPTIONAL { ?s wdt:P569 ?_Geburtsdatum. }
}
This one, on the other hand, only has one result (@de instead of @en):
SELECT ?_Geburtsdatum WHERE {
?s ?label "Brian O'Nolan"@de.
OPTIONAL { ?s wdt:P569 ?_Geburtsdatum. }
}
I hope that helps.
Cheers,
Lucas
On 02.04.2017 08:33, Detlef Küchler wrote:
> Hi,
>
> I got the following problem. If I use the search field of the main page
> searching for "Brian O'Nolan" I get a result.
> But if I use the following piece of code in the query service no
> result shows up.
>
> SELECT ?_Geburtsdatum WHERE {
> ?s ?label "Brian O'Nolan".
> OPTIONAL { ?s wdt:P569 ?_Geburtsdatum. }
> }
>
> What I'm doing wrong? Is it a problem of coding the apostrophe?
> If yes, how do I have to code it?
>
> Best regards
> Detlef
>
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