How many {author} are for {New Testament} ?
What is the number of authors of the new testament?
how many authors have there been for the new testament?
SELECT ( COUNT ( ?i ) AS ?h ) { resource:New_Testament property:author ?i }
SELECT (COUNT(?obj) AS ?objs ) {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q18813> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P50> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
} 

SELECT (COUNT(?obj) AS ?value ) { wd:Q18813 wdt:P50 ?obj }
1