What is the sum of Points, when Equipment was "Zabel-BSU", and when Position was 42?
CREATE TABLE "riders" (
  "position" real,
  "equipment" text,
  "points" real,
  "wins" text,
  "second" text,
  "third" text
);
SELECT SUM("points") FROM "riders" WHERE "equipment"='zabel-bsu' AND "position"=42;