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_57 (round INTEGER, position VARCHAR, player VARCHAR)
  ### Question:
  Name the Round which has a Position of defensive back and corey chavous?
  ### Answer:
  SELECT MIN(round) FROM table_name_57 WHERE position = "defensive back" AND player = "corey chavous"