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

find the program owners that have some programs in both morning and night time.
SELECT t1.owner FROM program AS t1 JOIN broadcast AS t2 ON t1.program_id = t2.program_id WHERE t2.time_of_day = "Morning" INTERSECT SELECT t1.owner FROM program AS t1 JOIN broadcast AS t2 ON t1.program_id = t2.program_id WHERE t2.time_of_day = "Night"
SELECT "t1"."owner" FROM "program" "t1" JOIN "broadcast" "t2" ON "Morning" = "t2"."time_of_day" AND "t1"."program_id" = "t2"."program_id" INTERSECT SELECT "t1"."owner" FROM "program" "t1" JOIN "broadcast" "t2" ON "Night" = "t2"."time_of_day" AND "t1"."program_id" = "t2"."program_id"