look for and find the earliest-started space program
Entity
m.04_50
Project Mercury
class literal
spaceflight.space_program 0^^http://www.w3.org/2001/XMLSchema#int
spaceflight.space_program type.datetime
Space program 0
none argmin
spaceflight.space_program.started
Started
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.space_program . 
{
SELECT (MIN(?y1) AS ?x1)  WHERE { 
?y0 :type.object.type :spaceflight.space_program . 
?y0 :spaceflight.space_program.started ?y1 . 
FILTER ( ?y0 != ?y1  )
}
}
?x0 :spaceflight.space_program.started ?x1 . 
FILTER ( ?x0 != ?x1  )
}
}
(ARGMIN spaceflight.space_program spaceflight.space_program.started)