SELECT max(t2.active_to_date) FROM customers AS t1 JOIN customer_contact_channels AS t2 ON t1.customer_id  =  t2.customer_id WHERE t1.customer_name  =  "Tillman Ernser"
Return the the "active to date" of the latest contact channel used by the customer named "Tillman Ernser".
SELECT max ( t2.active_to_date ) FROM customers AS t1 JOIN customer_contact_channels AS t2 ON t1.customer_id = t2.customer_id WHERE t1.customer_name = `` Tillman Ernser ''
select max ( t2 . active_to_date ) from customers as t1 join customer_contact_channels as t2 on t1 . customer_id = t2 . customer_id where t1 . customer_name = value
Return the the `` active to date '' of the latest contact channel used by the customer named `` Tillman Ernser '' .