I'm trying to extract some of the most recents data about covid-19 pandemic statistics (number of cases, recoveries, point in time) per country from Wikidata using this SPARQL query:
SELECT DISTINCT ?COVID19_loc ?COVID19_locLabel ?countryLabel ?cases ?timeC ?recoveries ?timeR {
?pandemic wdt:P1269 wd:Q81068910;
FILTER ( ?pandemic in ( wd:Q83741704)).
?pandemic wdt:P527 ?COVID19_loc.
?COVID19_loc wdt:P17 ?country.
?COVID19_loc wdt:P1603 ?cases.
FILTER NOT EXISTS {?COVID19_loc wdt:P1603/wdt:P585 ?timeC_Other FILTER ( ?timeC_Other > ?timeC)}.
?COVID19_loc wdt:P8010 ?recoveries.
FILTER NOT EXISTS {?COVID19_loc wdt:P8010/wdt:P585 ?timeR_Other FILTER ( ?timeR_Other > ?timeR)}.
SERVICE wikibase:label { bd:serviceParam wikibase:language "en". } }
The thing is I'm getting multiples cases and recoveries results instead of the most recents only, also timeC and timeR don't return a thing as shown in the image bellow:
Related
New to SPARQL, I'm trying to query Wikidata for all items that share at least k distinct values for a property with another item. For example, the following example is an attempt to list all diseases that share at least three different symptoms (wdt:P780) with COVID-19 (wd:Q84263196) and list each disease and all its shared symptoms. The following query comes close:
SELECT DISTINCT ?item ?itemLabel ?symptom1Label ?symptom2Label ?symptom3Label
WHERE
{
?item wdt:P780 ?symptom1, ?symptom2, ?symptom3.
wd:Q84263196 wdt:P780 ?symptom1, ?symptom2, ?symptom3.
FILTER (?symptom1 != ?symptom2)
FILTER (?symptom1 != ?symptom3)
FILTER (?symptom2 != ?symptom3)
SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE]". }
}
LIMIT 50
But the output shows all distinct combinations of three (common) symptoms. E.g.,
Q2840 influenza headache cough fatigue
Q2840 influenza headache cough nasal congestion
...
whereas the desired output should list each disease/symptom combination once (in either long or wide form).
I am trying to get all IBA cocktail entities, including their recipe, from Wikidata.
All terms i use are taken the wikidata documentation.
The query should return the name of the cocktail, all ingredients and their quantity (amount and unit).
My query returns everything i listed except the unit of the ingredient:
SELECT ?cocktail ?cocktailLabel ?cocktailDescription ?material ?quantity ?unit ?ingredient ?ingredientLabel WHERE {
?cocktail wdt:P31 wd:Q2536409; # cocktails from the IBA official cocktail list
p:P186 ?material. # get statement of materials used
?material ps:P186 ?ingredient; # get ingredient entity from materials used
pq:P1114 ?quantity. # get quantity of the relation
OPTIONAL {
?cocktail p:P186/psn:P186 [wikibase:quantityUnit ?unit ].
}
MINUS { ?material wdt:P31 wd:Q81727. } #remove cups from materials
SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en". }
}
This statement node should yield the identifier of cognac, the label of cognac, the amount (in this case 3) and the unit of 3 cognac (in this case centilitres).
What do I have to add to query?
The following SPARQL queries Wikidata for all European countries (sovereign states, Q3624078) and loads for each country the last few known population numbers (P:1082 population):
SELECT DISTINCT ?item $itemLabel ?population ?popDate
WHERE {
?item wdt:P31 wd:Q3624078. #select only sovereign states
?item wdt:P706/wdt:P361*|wdt:P361*|wdt:P30 wd:Q46. #select items which are geographically in Europe
?item p:P31 ?statement.
?statement ps:P31 wd:Q3624078.
FILTER NOT EXISTS { ?statement pq:P582 ?end. } #filter out items which are not sovereign states anymore
FILTER NOT EXISTS { ?item wdt:P31 wd:Q3024240. } #filter out historical countries
OPTIONAL {
?item p:P1082 ?popStatement.
?popStatement ps:P1082 ?population;
pq:P585 ?popDate.
FILTER ( YEAR(?popDate) >= 2014 )
}
SERVICE wikibase:label { bd:serviceParam wikibase:language "en". }
}
ORDER BY ASC($itemLabel)
You can test it here.
How can I limit the population data to the most recent population number?
I tried it by limiting it to a specific year (FILTER (YEAR(?popDate) = 2018), but this does not work because some countries don't have a population estimate for 2018.
This is similar to an SQL query like SELECT * FROM country c INNER JOIN population p ON p.CountryId = c.Id. In SQL, you would need to create a subquery with a MAX statement to find the most recent population data by country. How can I achieve the same in SPARQL?
I am using the following query against wikidata;
SELECT ?country ?countryLabel
WHERE
{
?country wdt:P30 wd:Q46;
wdt:P31 wd:Q6256.
SERVICE wikibase:label { bd:serviceParam wikibase:language
"[AUTO_LANGUAGE],en". }
}
where P30 is continent; Q46 is Europe; P31 is Instance Of and Q6256 is country;
https://query.wikidata.org/#SELECT%20%3Fcountry%20%3FcountryLabel%0A%20%20%20%20%20%20WHERE%0A%20%20%20%20%20%20%7B%0A%20%20%20%20%20%20%20%20%3Fcountry%20%20%20wdt%3AP30%20wd%3AQ46%3B%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20wdt%3AP31%20wd%3AQ6256.%0A%20%20%20%20%20%20%20%20SERVICE%20wikibase%3Alabel%20%7B%20bd%3AserviceParam%20wikibase%3Alanguage%0A%20%20%20%20%20%20%20%20%22%5BAUTO_LANGUAGE%5D%2Cen%22.%20%7D%0A%20%20%20%20%20%20%7D
Yet this query only returns 15 countries of Europe. For instance Sweden is not returned even though Sweden appears to match the query at https://www.wikidata.org/wiki/Q34
So even though the query seems to be correct yet it is missing out many countries. Any ideas on how to resolve this?
While comparing the two entries; one for Germany/Sweden (which do not show up) and Norway which does show up, the difference I could find was that Germany/Sweden has a preferred rank for Sovereign State while just a normal rank for Country. This could be a reason where the WHERE clause decides to only show the preferred rank if it exists; and skip the remaining statements. If this be the case and I suspect it is; I wonder if there is a way to override the behavior of the query engine to search through all statements with either a preferred rank or a normal rank.
I am getting a better selection of countries when going around the truthy's by using statements. The statements are able to pull out all the statements even those with normal ranks.
SELECT DISTINCT ?country ?countryLabel
WHERE
{
?country wdt:P30 wd:Q46.
?country p:P31 ?country_instance_of_statement .
?country_instance_of_statement ps:P31 wd:Q6256 .
SERVICE wikibase:label { bd:serviceParam wikibase:language
"[AUTO_LANGUAGE],en".
}
filter not exists{?country p:P31/ps:P31 wd:Q3024240 }
}
order by ?countryLabel
I still have a few extra countries showing up; such as German Empire. But I think that's a different problem to fix.
https://query.wikidata.org/#SELECT%20distinct%20%3Fcountry%20%3Fcountry_instance_of_statement%20%3FcountryLabel%0A%20%20%20%20%20%20WHERE%0A%20%20%20%20%20%20%7B%0A%20%20%20%20%20%20%20%20%3Fcountry%20%20%20wdt%3AP30%20wd%3AQ46.%0A%20%20%20%20%20%20%20%20%3Fcountry%20p%3AP31%20%3Fcountry_instance_of_statement%20.%0A%20%20%20%20%20%20%20%20%3Fcountry_instance_of_statement%20ps%3AP31%20wd%3AQ6256%20.%0A%20%20%20%20%20%20%20%20SERVICE%20wikibase%3Alabel%20%7B%20bd%3AserviceParam%20wikibase%3Alanguage%0A%20%20%20%20%20%20%20%20%22%5BAUTO_LANGUAGE%5D%2Cen%22.%20%0A%20%20%20%20%20%20%20%20%7D%0A%20%20%20%20%20%20%20%20filter%20not%20exists%7B%3Fcountry%20p%3AP31%2Fps%3AP31%20wd%3AQ3024240%20%7D%0A%20%20%20%20%20%20%7D%20%0A
Note that country_instance_of_statement captures all the statements irrespective of rank. And once I have those than I use 'ps:P31 wd:Q6256' to pull out those that have country ("wd:Q6256") as the object.
I have added in suggestions from #AKSW above.
And for those who want another approach using end time for country, this is the sparql
SELECT distinct ?country ?countryLabel
WHERE
{
?country wdt:P30 wd:Q46.
?country p:P31 ?country_instance_of_statement .
?country_instance_of_statement ps:P31 wd:Q6256 .
filter not exists {?country_instance_of_statement pq:P582 ?endTime }
SERVICE wikibase:label { bd:serviceParam wikibase:language
"[AUTO_LANGUAGE],en".
}
}
order by ?countryLabel
https://query.wikidata.org/#SELECT%20distinct%20%3Fcountry%20%3Fcountry_instance_of_statement%20%3FcountryLabel%0A%20%20%20%20%20%20WHERE%0A%20%20%20%20%20%20%7B%0A%20%20%20%20%20%20%20%20%3Fcountry%20%20%20wdt%3AP30%20wd%3AQ46.%0A%20%20%20%20%20%20%20%20%3Fcountry%20p%3AP31%20%3Fcountry_instance_of_statement%20.%0A%20%20%20%20%20%20%20%20%3Fcountry_instance_of_statement%20ps%3AP31%20wd%3AQ6256%20.%0A%20%20%20%20%20%20%20%20filter%20not%20exists%20%7B%3Fcountry_instance_of_statement%20pq%3AP582%20%3FendTime%20%7D%0A%20%20%20%20%20%20%20%20SERVICE%20wikibase%3Alabel%20%7B%20bd%3AserviceParam%20wikibase%3Alanguage%0A%20%20%20%20%20%20%20%20%22%5BAUTO_LANGUAGE%5D%2Cen%22.%20%0A%20%20%20%20%20%20%20%20%7D%0A%20%20%20%20%20%20%7D%20%0A
I want to query the neighbours to a country with SPARQL from Wikidata like this:
SELECT ?country ?countryLabel WHERE {
?country wdt:P47 wd:Q183 .
FILTER NOT EXISTS{ ?country wdt:P576 ?date } # don't count dissolved country - at least filters German Democratic Republic
SERVICE wikibase:label {
bd:serviceParam wikibase:language "en" .
}
}
My issue is that e.g. in this example for neighbours of germany there are still countries shown which does not exist anymore like:
Kingdom of Denmark or
Saarland.
Already tried
I could already reduce the number by the FILTER statement.
Question
How to make the statement to reduce it to 9 countries?
(also dividing in land boarder and sea boarder would be great)
Alternative
Filtering at this API would be also fine for me https://www.wikidata.org/w/api.php?action=wbgetentities&ids=Q35
a database or lists or prepared HashMaps whatever with all countries of the world with neighbours
You could check entities of type wd:Q133346 ('border') or wd:Q12413618 ('international border'):
SELECT ?border ?borderLabel ?country1Label ?country2Label ?isLandBorder ?isMaritimeBorder ?constraint {
VALUES (?country1) {(wd:Q183)}
?border wdt:P31 wd:Q12413618 ;
wdt:P17 ?country1 , ?country2 .
FILTER (?country1 != ?country2)
BIND (EXISTS {?border wdt:P31 wd:Q15104814} AS ?isLandBorder)
BIND (EXISTS {?border wdt:P31 wd:Q3089219} AS ?isMaritimeBorder)
BIND ((?isLandBorder || ?isMaritimeBorder) AS ?constraint)
SERVICE wikibase:label { bd:serviceParam wikibase:language "en". }
} ORDER BY ?country1Label
Try it!
In some sense, records are duplicated: for the Afghanistan–Uzbekistan border, the list contains both (?country1=Afganistan,?country2=Uzbekistan) and (?country1=Uzbekistan,?country2=Afganistan).
a database or lists or prepared HashMaps whatever with all countries of the world with neighbours
You could ask on https://opendata.stackexchange.com.