How many laps have 16 points and With a Laps Led of greater than 0?
CREATE TABLE "results" (
  "fin_pos" real,
  "car_no" real,
  "driver" text,
  "team" text,
  "laps" real,
  "time_retired" text,
  "grid" real,
  "laps_led" real,
  "points" text
);
SELECT SUM("laps") FROM "results" WHERE "points"='16' AND "laps_led">0;