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_28 (date VARCHAR, competition VARCHAR, opponents VARCHAR)
### Question:
What is Date, when Competition is "F", and when Opponents is "FC Astoria Walldorf"?
### Answer:
SELECT date FROM table_name_28 WHERE competition = "f" AND opponents = "fc astoria walldorf"