SELECT 
	channel.channel_name, program_title, start_time, finish_time
FROM 
	program, channel 
WHERE 
	program.channel_id='3'
AND
	program.channel_id=channel.channel_id 
UNION
SELECT 
	channel.channel_name, program_title, start_time, finish_time
FROM 
	program, channel 
WHERE 
	program.channel_id='2'
AND 
	program.channel_id=channel.channel_id;