CREATE TABLE "men_s_50_km" (
  "winner" text,
  "country" text,
  "winter_olympics" real,
  "fis_nordic_world_ski_championships" text,
  "holmenkollen" text
);

Question: What country was ole ellefsæter from?
SQL: SELECT "country" FROM "men_s_50_km" WHERE "winner"='ole ellefsæter';

Question: Who won the FIS Nordic World Ski Championships in 1972?
SQL: SELECT "winner" FROM "men_s_50_km" WHERE "fis_nordic_world_ski_championships"='1972';