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'
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 = value
Find the name and active date of the customer that use email as the contact channel .