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_47 (date VARCHAR, winning_driver VARCHAR, circuit VARCHAR)
### Question:
What is the date of the circuit of nürburgring, which had Graham Hill as the winning driver?
### Answer:
SELECT date FROM table_name_47 WHERE winning_driver = "graham hill" AND circuit = "nürburgring"