Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE customers (date_became_customer VARCHAR, customer_id INTEGER)
### Question:
Find the "date became customers" of the customers whose ID is between 10 and 20.
### Answer:
SELECT date_became_customer FROM customers WHERE customer_id BETWEEN 10 AND 20