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 region (region_name VARCHAR, region_id VARCHAR); CREATE TABLE affected_region (region_name VARCHAR, region_id VARCHAR)
  ### Question:
  Show the name for regions not affected.
  ### Answer:
  SELECT region_name FROM region WHERE NOT region_id IN (SELECT region_id FROM affected_region)