CREATE TABLE table_204_511 (id DECIMAL, "number" DECIMAL, "driver" TEXT, "entrant" TEXT, "chassis" TEXT, "engine" TEXT, "tyre" TEXT)

who is the only driver to use a ferrari chassis ?
SELECT "driver" FROM table_204_511 WHERE "chassis" = 'ferrari'
SELECT "driver" FROM "table_204_511" WHERE "chassis" = 'ferrari'