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 (frequency VARCHAR, identifier VARCHAR)
### Question:
What's the frequency when the identifier is cbf-fm-9?
### Answer:
SELECT frequency FROM table_name_47 WHERE identifier = "cbf-fm-9"