Which contact channel has been used by the customer with name 'Tillman Ernser'?
CREATE TABLE addresses (
    address_id number,
    address_content text,
    city text,
    zip_postcode text,
    state_province_county text,
    country text,
    other_address_details text
)

CREATE TABLE customer_contact_channels (
    customer_id number,
    channel_code text,
    active_from_date time,
    active_to_date time,
    contact_number text
)

CREATE TABLE customers (
    customer_id number,
    payment_method text,
    customer_name text,
    date_became_customer time,
    other_customer_details text
)

CREATE TABLE order_items (
    order_id number,
    product_id number,
    order_quantity text
)

CREATE TABLE customer_orders (
    order_id number,
    customer_id number,
    order_status text,
    order_date time,
    order_details text
)

CREATE TABLE products (
    product_id number,
    product_details text
)

CREATE TABLE customer_addresses (
    customer_id number,
    address_id number,
    date_address_from time,
    address_type text,
    date_address_to time
)
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"
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: Which contact channel has been used by the customer with name 'Tillman Ernser'? ### Input: CREATE TABLE addresses (
    address_id number,
    address_content text,
    city text,
    zip_postcode text,
    state_province_county text,
    country text,
    other_address_details text
)

CREATE TABLE customer_contact_channels (
    customer_id number,
    channel_code text,
    active_from_date time,
    active_to_date time,
    contact_number text
)

CREATE TABLE customers (
    customer_id number,
    payment_method text,
    customer_name text,
    date_became_customer time,
    other_customer_details text
)

CREATE TABLE order_items (
    order_id number,
    product_id number,
    order_quantity text
)

CREATE TABLE customer_orders (
    order_id number,
    customer_id number,
    order_status text,
    order_date time,
    order_details text
)

CREATE TABLE products (
    product_id number,
    product_details text
)

CREATE TABLE customer_addresses (
    customer_id number,
    address_id number,
    date_address_from time,
    address_type text,
    date_address_to time
) ### Response: 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"