CREATE TABLE "medal_winners" (
  "event" text,
  "gold" text,
  "silver" text,
  "bronze" text,
  "4th_place" text
);

Question: Who won the gold when Bertil Ahlin Sweden won the silver?
SQL: SELECT "gold" FROM "medal_winners" WHERE "silver"='bertil ahlin sweden';

Question: Who won the gold when Jules van Dyk Belgium won bronze?
SQL: SELECT "gold" FROM "medal_winners" WHERE "bronze"='jules van dyk belgium';