Find the name and active date of the customer that use email as the contact channel.
SELECT t1.customer_name ,  t2.active_from_date FROM customers AS t1 JOIN customer_contact_channels AS t2 ON t1.customer_id  =  t2.customer_id WHERE t2.channel_code  =  'Email'
SELECT t1.customer_name ,  t2.active_from_date FROM customers AS t1 JOIN customer_contact_channels AS t2 ON t1.customer_id  =  t2.customer_id WHERE t2.channel_code  =  'Email'
[{'customer_name': 'Devin Mills', 'active_from_date': '2017-12-07 18:18:15'}, {'customer_name': 'Tillman Ernser', 'active_from_date': '2017-04-07 04:51:41'}, {'customer_name': 'Devin Mills', 'active_from_date': '2017-05-25 16:08:45'}, {'customer_name': 'Tillman Ernser', 'active_from_date': '2018-01-05 21:42:56'}]