CREATE TABLE "winners" (
  "year" real,
  "dates" text,
  "champion" text,
  "country" text,
  "score" text,
  "margin_of_victory" text,
  "tournament_location" text,
  "purse_us" real,
  "winners_share" real
);

Question: Name the least purse for 2011
SQL: SELECT MIN("purse_us") FROM "winners" WHERE "year"=2011;