$dbh->prepare('
	SELECT message_table.message_id, message_table.message_date, 
	message_table.message_time,message_table.message_sender_name,
	message_table.message_to_name, message_table.department_id
	FROM department_table 
	INNER JOIN message_table 
	ON department_table.department_id = message_table.department_id
	WHERE message_table.department_id = ?
');