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_90 (decile VARCHAR, roll VARCHAR)
  ### Question:
  tell me the total number of decile with a roll showing 251.
  ### Answer:
  SELECT COUNT(decile) FROM table_name_90 WHERE roll = 251