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_99 (callsign VARCHAR, frequency VARCHAR)
### Question:
Frequency of 0 864 has what callsign?
### Answer:
SELECT callsign FROM table_name_99 WHERE frequency = "0 864"