which network is the channel which started before 1987-07-01 on?
Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity
m.01h_yt m.02p10m m.0kcbd m.02khm_ m.02wlv6g m.0ncl8zk m.052307 m.03qc7_x m.02bv5k m.04r7ts m.02p7v2n m.03cf611 m.02q8kf9 m.0gff8nr
City Univision Fox Sports Networks Viacom Media Networks YLE British Broadcasting Corporation Comcast SportsNet Rediffusion CTV Two Omni Television SBS Television Pay TV National Television Company of Ukraine Root Sports
class class literal
tv.tv_network broadcast.tv_channel 1987-07-01^^http://www.w3.org/2001/XMLSchema#date
tv.tv_network broadcast.tv_channel type.datetime
TV Network TV Channel 1987-07-01
none none <
tv.tv_network.channels broadcast.tv_channel.from
Channels From
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 :tv.tv_network . 
?x1 :type.object.type :broadcast.tv_channel . 
FILTER (?x2 < "1987-07-01-08:00"^^<http://www.w3.org/2001/XMLSchema#date>)
?x0 :tv.tv_network.channels ?x1 . 
?x1 :broadcast.tv_channel.from ?x2 . 
FILTER ( ?x0 != ?x1 && ?x0 != ?x2 && ?x1 != ?x2  )
}
}
(AND tv.tv_network (JOIN tv.tv_network.channels (lt broadcast.tv_channel.from 1987-07-01^^http://www.w3.org/2001/XMLSchema#date)))