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_11 (name VARCHAR, presentation_of_credentials VARCHAR)
  ### Question:
  Who presented their credentials at an unknown date?
  ### Answer:
  SELECT name FROM table_name_11 WHERE presentation_of_credentials = "unknown"