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"
CREATE TABLE customers (customer_id VARCHAR, customer_name VARCHAR); CREATE TABLE customer_contact_channels (customer_id VARCHAR)
ลูกค้าชื่อ "ทิลแมน เอิร์นเซอร์" ใช้ช่องทางการติดต่อใด?
Which contact channel has been used by the customer with name "Tillman Ernser"?