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