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, order_id VARCHAR)
  ### Question:
  Show the product ids and the number of unique orders containing each product.
  ### Answer:
  SELECT product_id, COUNT(DISTINCT order_id) FROM Order_items GROUP BY product_id