CREATE TABLE program (program_id NUMBER, name CLOB, origin CLOB, launch NUMBER, owner CLOB)
CREATE TABLE channel (channel_id NUMBER, name CLOB, owner CLOB, share_in_percent NUMBER, rating_in_percent NUMBER)
CREATE TABLE broadcast (channel_id NUMBER, program_id NUMBER, time_of_day CLOB)
CREATE TABLE broadcast_share (channel_id NUMBER, program_id NUMBER, date CLOB, share_in_percent NUMBER)

Which channels broadcast both in the morning and at night? Give me the channel names.
SELECT t1.name FROM channel AS t1 JOIN broadcast AS t2 ON t1.channel_id = t2.channel_id WHERE t2.time_of_day = 'Morning' INTERSECT SELECT t1.name FROM channel AS t1 JOIN broadcast AS t2 ON t1.channel_id = t2.channel_id WHERE t2.time_of_day = 'Night'
SELECT "t1"."name" FROM "channel" "t1" JOIN "broadcast" "t2" ON "t1"."channel_id" = "t2"."channel_id" AND "t2"."time_of_day" = 'Morning' INTERSECT SELECT "t1"."name" FROM "channel" "t1" JOIN "broadcast" "t2" ON "t1"."channel_id" = "t2"."channel_id" AND "t2"."time_of_day" = 'Night'