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 (customer_id VARCHAR); CREATE TABLE Customer_Payments (customer_id VARCHAR)
### Question:
List the number of customers that did not have any payment history.
### Answer:
SELECT COUNT(*) FROM Customers WHERE NOT customer_id IN (SELECT customer_id FROM Customer_Payments)