When the total winners was smaller than 2 and 2 woman won, what's the average of the men's half marathon winners?
CREATE TABLE "winners_by_country" (
  "country" text,
  "total" real,
  "marathon_men_s" real,
  "marathon_women_s" real,
  "half_marathon_men_s" real,
  "half_marathon_women_s" real
);
SELECT AVG("half_marathon_men_s") FROM "winners_by_country" WHERE "marathon_women_s"=2 AND "total"<2;