How many {date of birth} are for {Jean le Rond D'Alembert} ?
On what date was Jean le Rond D'Alemberts born?
What is Jean le Rond D'Alembert's birthday?
SELECT ( COUNT ( ?l ) AS ?j ) { resource:Jean_le_Rond_d'Alembert property:date_of_birth ?l }
SELECT (COUNT(?obj) AS ?objs ) {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q153232> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P569> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
} 

SELECT (COUNT(?obj) AS ?value ) { wd:Q153232 wdt:P569 ?obj }
1