which rocket had its maiden flight on 1956-09-20?
Entity
m.0gnyg
Jupiter-C
class literal
spaceflight.rocket 1956-09-20^^http://www.w3.org/2001/XMLSchema#date
spaceflight.rocket type.datetime
Rocket 1956-09-20
none none
spaceflight.rocket.maiden_flight
Maiden Flight
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> PREFIX : <http://rdf.freebase.com/ns/> 
SELECT (?x0 AS ?value) WHERE {
SELECT DISTINCT ?x0  WHERE { 
?x0 :type.object.type :spaceflight.rocket . 
VALUES ?x1 { "1956-09-20-08:00"^^<http://www.w3.org/2001/XMLSchema#date> } 
?x0 :spaceflight.rocket.maiden_flight ?x1 . 
FILTER ( ?x0 != ?x1  )
}
}
(AND spaceflight.rocket (JOIN spaceflight.rocket.maiden_flight 1956-09-20^^http://www.w3.org/2001/XMLSchema#date))