text: 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)