CREATE TABLE table_52604 ("Race" TEXT, "Circuit" TEXT, "Date" TEXT, "Pole position" TEXT, "Fastest lap" TEXT, "Winning driver" TEXT, "Constructor" TEXT, "Tyre" TEXT, "Report" TEXT)

Who has the pole position for the n rburgring circuit?
SELECT "Pole position" FROM table_52604 WHERE "Circuit" = 'nürburgring'
SELECT "Pole position" FROM "table_52604" WHERE "Circuit" = 'nürburgring'