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 order_items (product_id VARCHAR)
  ### Question:
  What is the id of the product that was ordered the most often?
  ### Answer:
  SELECT product_id FROM order_items GROUP BY product_id ORDER BY COUNT(*) DESC LIMIT 1