What is Winner, when City / State is "Mallala , South Australia", and when Team is "Elfin Sports Cars"?
CREATE TABLE "race_calendar" (
  "circuit" text,
  "city_state" text,
  "date" text,
  "winner" text,
  "team" text
);
SELECT "winner" FROM "race_calendar" WHERE "city_state"='mallala , south australia' AND "team"='elfin sports cars';