what rocket engine has the smallest diameter?
Entity Entity Entity
m.02xlvqg m.02xlvpt m.02xlvlz
RD-1 RD-1KhZ RD-210
class literal
spaceflight.rocket_engine 0^^http://www.w3.org/2001/XMLSchema#int
spaceflight.rocket_engine type.float
Rocket engine 0
none argmin
spaceflight.rocket_engine.diameter
Diameter
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_engine . 
{
SELECT (MIN(?y1) AS ?x1)  WHERE { 
?y0 :type.object.type :spaceflight.rocket_engine . 
?y0 :spaceflight.rocket_engine.diameter ?y1 . 
FILTER ( ?y0 != ?y1  )
}
}
?x0 :spaceflight.rocket_engine.diameter ?x1 . 
FILTER ( ?x0 != ?x1  )
}
}
(ARGMIN spaceflight.rocket_engine spaceflight.rocket_engine.diameter)