Database: customers_and_addresses
Question: What is the "active to date" of the contact channel with maximum activating date used by "Tillman Ernser"?
SQL: 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"