How many wins for billy casper over 8 events and uner $71,979 in earnings?
CREATE TABLE "leaders" (
  "rank" real,
  "player" text,
  "country" text,
  "earnings" real,
  "events" real,
  "wins" real
);
SELECT MIN("wins") FROM "leaders" WHERE "events"=8 AND "player"='billy casper' AND "earnings"<'71,979';