Task: Text to Code
Input (English): SQL: SELECT date_became_customer FROM Customers WHERE customer_name LIKE "Tillman Ernser"
Feedback: Replace date became customer with channel code , customers with customer contact channels , customer name with Customers's customer name .
Output (English): SELECT DISTINCT channel_code FROM customers AS t1 JOIN customer_contact_channels AS t2 ON t1.customer_id  =  t2.customer_id WHERE t1.customer_name  =  "Tillman Ernser"