Re: [Tracker] SPARQL question

[Martyn Russell <martyn lanedo com>]

On 03/11/10 17:57, Ken Schmedding wrote:
> I admit I have difficulty wrapping my head around these queries so here
> is my question.
> The following query (Tracker 0.8.17) will find all files with the tag "here"
>
> tracker-sparql -q "SELECT ?s nie:url(?s) nie:mimeType(?s)
> WHERE { ?s a nfo:FileDataObject;nao:hasTag [nao:prefLabel'here'] }"
>
> Now what if I want to search for the tags "here" or "there" or "now"?
> Can I do this in a single query that will give all the files that
> contain one of these terms, and can I do it without repeating results?

Hi,

This works for me here locally (labels replaced), however,

tracker-sparql -q "SELECT ?urn nie:url(?urn) WHERE { ?urn a 
nfo:FileDataObject FILTER ( EXISTS { ?tag nao:hasTag [ nao:prefLabel 
?label ] . FILTER(?label IN ('here','there', 'now')) } ) }"

After checking with Juergbi, the extra "FILTER ( EXISTS " is needed to 
filter duplicates.

--
Regards,
Martyn