What is {population} of {Port Said Governorate} that is {determination method} is {census} ?
Quote the population cited by census for Port Said Governorate
What is the population of Port Said Governorate that was determined by census?
SELECT ?b WHERE { ?o property:population ?b . ?o property:determination_method resource:census . resource:Port_Said_Governorate property:population ?o }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q31079> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P1082> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
?statement <http://www.wikidata.org/entity/P459> <http://wikidata.dbpedia.org/resource/Q39825>
} 

SELECT ?obj WHERE { wd:Q31079 p:P1082 ?s . ?s ps:P1082 ?obj . ?s pq:P459 wd:Q39825 }