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 (date VARCHAR, location VARCHAR, result VARCHAR, competition VARCHAR)
  ### Question:
  What date has a result of win, in a friendly competition in Porto?
  ### Answer:
  SELECT date FROM table_name_79 WHERE result = "win" AND competition = "friendly" AND location = "porto"