What is {number of out of school children} of {Tajikistan} that is {point in time} is {2000-1-1} ?
How many students were there in Tajikistan at the start of the year 2000?
How many out of school children were there in Tajikistan in 2000-1-1?
SELECT ?r WHERE { ?p property:number_of_out-of-school_children ?r . FILTER ( CONTAINS ( YEAR ( ?p ) , '2000' ) ) . ?p property:point_in_time ?p . resource:Tajikistan property:number_of_out-of-school_children ?p }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q863> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P2573> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
?statement <http://www.wikidata.org/entity/P585> <2000-1-1>
} 

SELECT ?obj WHERE { wd:Q863 p:P2573 ?s . ?s ps:P2573 ?obj . ?s pq:P585 ?x filter(contains(YEAR(?x),'2000')) }