which program owners have programs in the morning and the 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"
programs in the morning and the night refers to filtering records based on Time_of_day = 'Morning' and Time_of_day = 'Night'; program owners refers to owner from program; INTERSECT used to find common records meeting both conditions.