To get counts of usage you have to do something like
select ?pq count(*) { ?p wikibase:qualifier ?pq ?x ?pq ?y } groupby ?pq
(well, you also want the labels).
Fortunately the counts are available at the page Lydia mentioned.
peter
On 07/16/2018 03:45 AM, Vladimir Alexiev wrote:
The list of props (4.9k) is returned quickly enough. Unfortunately it includes all props: each one has a wikibase:qualifier "just in case"
select * { ?p wikibase:qualifier ?pq }
It is a pity that this one times out, since the filter merely needs to look for 1 statement instance, 4.9k times:
select * { ?p wikibase:qualifier ?pq filter exists {?x ?pq ?y} } limit 100
What query did you try?
On Sat, Jul 14, 2018 at 2:40 AM, Peter F. Patel-Schneider pfpschneider@gmail.com wrote:
I'm trying to get a good estimate of how often which qualifier predicate is used.
The obvious query times out, as expected, so I was trying to find a list of predicates that are used as qualifiers so that I can craft a query for each of them. There is https://www.wikidata.org/wiki/Wikidata:List_of_properties/Wikidata_qualifier but that can't be trusted as it doesn't include start time (P580) or end time (P582) which I expect to be the most common qualifier predicates.
So, I'm stumped. Any suggestions?
peter
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