Retrieving Covid-19 pandemic statistics per country from DBpedia - sparql

Question

I'm trying to get the arrival date, the confirmed and recovery cases total and the deaths total of Covid-19 pandemic per country from DBpedia, using this query:
PREFIX dbp: <http://dbpedia.org/property/>
SELECT distinct ?country ?arrivalDate ?confirmedCases ?recoveryCases ?deaths WHERE {
?country a dbp:location;
dbp:arrivalDate ?arrivalDate;
dbp:confirmedCases ?confirmedCases;
dbp:recoveryCases ?recoveryCases;
dbp:deaths ?deaths
}
Unfortunately, it doesn't return anything

Answer 1

?country a dbp:location
With this triple pattern, you are trying to find entities that have http://dbpedia.org/property/location as type (rdf:type). This is not what you intend, because
dbp:location is a property (not a class), and
in the subject position, you don’t seem to want to find locations, but information about the pandemic.
So ideally rename ?country to something like ?pandemicInfo (for clarity), and then ask for the dbp:location of that ?pandemicInfo:
SELECT DISTINCT ?pandemicInfo ?country ?arrivalDate ?confirmedCases ?recoveryCases ?deaths
WHERE {
?pandemicInfo
dbp:location ?country ;
dbp:arrivalDate ?arrivalDate ;
dbp:confirmedCases ?confirmedCases ;
dbp:recoveryCases ?recoveryCases ;
dbp:deaths ?deaths .
}
To only get information about the COVID-19 pandemic, you could add:
dbo:disease dbr:COVID-19
And if there is a type that all entities share, e.g., dbo:Pandemic, you could add:
a dbo:Pandemic
(But you should verify if all the entities you are interested in contain these statements, otherwise you would exclude them.)