CREATE TABLE table_71615 ("Date" CLOB, "Company" CLOB, "Business" CLOB, "Country" CLOB, "Value  (  USD  ) " CLOB)

For the Enernoc Australia Pty Ltd, what's the country with an unknown date?
SELECT "Country" FROM table_71615 WHERE "Date" = 'unknown' AND "Company" = 'enernoc australia pty ltd'
SELECT "Country" FROM "table_71615" WHERE "Company" = 'enernoc australia pty ltd' AND "Date" = 'unknown'