For the Enernoc Australia Pty Ltd, what's the country with an unknown date?
CREATE TABLE table_name_15 (
    country VARCHAR,
    date VARCHAR,
    company VARCHAR
)
SELECT country FROM table_name_15 WHERE date = "unknown" AND company = "enernoc australia pty ltd"
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: For the Enernoc Australia Pty Ltd, what's the country with an unknown date? ### Input: CREATE TABLE table_name_15 (
    country VARCHAR,
    date VARCHAR,
    company VARCHAR
) ### Response: SELECT country FROM table_name_15 WHERE date = "unknown" AND company = "enernoc australia pty ltd"