CREATE TABLE "open_division" (
  "year" real,
  "mens_singles" text,
  "womens_singles" text,
  "mens_doubles" text,
  "womens_doubles" text,
  "a_mixed_doubles" text,
  "b_mixed_doubles" text
);

Question: What is the least year when men's singles is Raju Rai?
SQL: SELECT MIN("year") FROM "open_division" WHERE "mens_singles"='Raju Rai';