Who are the owners of the programs that broadcast both in the morning and at night?
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"