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 table_name_79 (episode_number INTEGER, air_date VARCHAR)
  ### Question:
  What is the lowest of  Episode Number that has a Air Date on 20 july 2007?
  ### Answer:
  SELECT MIN(episode_number) FROM table_name_79 WHERE air_date = "20 july 2007"