What is the channel code and contact number of the customer contact channel that was active for the longest time?
SELECT channel_code ,  contact_number FROM customer_contact_channels WHERE active_to_date - active_from_date  =  (SELECT active_to_date - active_from_date FROM customer_contact_channels ORDER BY (active_to_date - active_from_date) DESC LIMIT 1)
SELECT channel_code ,  contact_number FROM customer_contact_channels WHERE active_to_date - active_from_date  =  (SELECT active_to_date - active_from_date FROM customer_contact_channels ORDER BY (active_to_date - active_from_date) DESC LIMIT 1)
[{'channel_code': 'Email', 'contact_number': '940.035.6435x0225'}, {'channel_code': 'Email', 'contact_number': '189.449.8326x7607'}, {'channel_code': 'Email', 'contact_number': '958-653-2640'}, {'channel_code': 'Cell', 'contact_number': '(165)527-5756x2419'}, {'channel_code': 'Cell', 'contact_number': '1-077-864-0102'}, {'channel_code': 'Handheld', 'contact_number': '06068550461'}, {'channel_code': 'Handheld', 'contact_number': '542.983.0224'}, {'channel_code': 'Handheld', 'contact_number': '(379)834-0867x267'}, {'channel_code': 'Handheld', 'contact_number': '(620)266-6990x8590'}, {'channel_code': 'Fax', 'contact_number': '(068)656-5276x84466'}, {'channel_code': 'Fax', 'contact_number': '496-074-8589x5477'}, {'channel_code': 'Handheld', 'contact_number': '1-687-190-8968x63811'}, {'channel_code': 'Handheld', 'contact_number': '445.924.9417'}, {'channel_code': 'Mobile', 'contact_number': '(155)830-6182'}, {'channel_code': 'Handheld', 'contact_number': '1-453-027-1291'}, {'channel_code': 'Cell', 'contact_number': '495-168-9662'}, {'channel_code': 'Cell', 'contact_number': '846.043.4809x0426'}]