CREATE TABLE "previous_winners" (
  "year" real,
  "men_s_singles" text,
  "women_s_singles" text,
  "men_s_doubles" text,
  "women_s_doubles" text,
  "mixed_doubles" text
);

Question: Who won Women's doubles when Nikhil Kanetkar won Men's singles?
SQL: SELECT "women_s_doubles" FROM "previous_winners" WHERE "men_s_singles"='nikhil kanetkar';

Question: Who won Women's doubles when Zen Yaqiong won Women's singles?
SQL: SELECT "women_s_doubles" FROM "previous_winners" WHERE "women_s_singles"='zen yaqiong';