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_15 (country VARCHAR, date VARCHAR, company VARCHAR)
### Question:
For the Enernoc Australia Pty Ltd, what's the country with an unknown date?
### Answer:
SELECT country FROM table_name_15 WHERE date = "unknown" AND company = "enernoc australia pty ltd"