HOW MANY YEARS DID MENS DOUBLES PLAYER HEIKI SORGE MEELIS MAISTE PLAY?
CREATE TABLE "past_winners" (
  "year" real,
  "mens_singles" text,
  "womens_singles" text,
  "mens_doubles" text,
  "womens_doubles" text,
  "mixed_doubles" text
);
SELECT COUNT("year") FROM "past_winners" WHERE "mens_doubles"='Heiki Sorge Meelis Maiste';