How many {type of electrification} are for {Amsterdam Metro} ?
What kind of electrification is employed by the Amsterdam Metro?
Amsterdam Metro has what type of electrification?
SELECT ( COUNT ( ?d ) AS ?m ) { resource:Amsterdam_Metro property:type_of_electrification ?d }
SELECT (COUNT(?obj) AS ?objs ) {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q260870> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P930> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
} 

SELECT (COUNT(?obj) AS ?value ) { wd:Q260870 wdt:P930 ?obj }
2