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 INVOICES (Product_ID VARCHAR)
  ### Question:
  What is the product ID of the most frequently ordered item on invoices?
  ### Answer:
  SELECT Product_ID FROM INVOICES GROUP BY Product_ID ORDER BY COUNT(*) DESC LIMIT 1