How many {official residence} are for {Parthian Empire} ?
How many people live in the Parthian Empire?
How many official residences are there in the Parthian Empire?
SELECT ( COUNT ( ?v ) AS ?l ) { resource:Parthian_Empire property:official_residence ?v }
SELECT (COUNT(?obj) AS ?objs ) {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q1986139> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P263> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
} 

SELECT (COUNT(?obj) AS ?value ) { wd:Q1986139 wdt:P263 ?obj }
7