how many meteor showers did c/1861 g1 (thatcher) spawn?
Value
1
class entity
astronomy.meteor_shower m.026v4vz
astronomy.meteor_shower astronomy.comet
Meteor Shower C/1861 G1 (Thatcher)
count none
astronomy.comet.meteor_shower_spawned
Meteor shower spawned
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 (COUNT(?x0) AS ?value) WHERE {
SELECT DISTINCT ?x0  WHERE { 
?x0 :type.object.type :astronomy.meteor_shower . 
VALUES ?x1 { :m.026v4vz } 
?x1 :astronomy.comet.meteor_shower_spawned ?x0 . 
FILTER ( ?x0 != ?x1  )
}
}
(COUNT (AND astronomy.meteor_shower (JOIN (R astronomy.comet.meteor_shower_spawned) m.026v4vz)))