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 Accounts (customer_id VARCHAR)
  ### Question:
  Show customer ids who don't have an account.
  ### Answer:
  SELECT customer_id FROM Customers EXCEPT SELECT customer_id FROM Accounts