ช่องที่ออกอากาศทั้งเช้าและกลางคืนชื่ออะไร ไม่จำเป็นต้องใช้ทุกตาราง
what are the names of the channels that broadcast in both morning and night?It is not neccessary to use all the tables.
 channel:  (name [ VARCHAR ] channel_id [ VARCHAR) ]
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'