CREATE TABLE "winners" (
  "tour" text,
  "mens_singles" text,
  "womens_singles" text,
  "mens_doubles" text,
  "womens_doubles" text,
  "mixed_doubles" text
);

Question: when womens singles is wang yihan and tour is french super series, what were the men's singles?
SQL: SELECT "mens_singles" FROM "winners" WHERE "womens_singles"='Wang Yihan' AND "tour"='French Super Series';

Question: when mixed doubles is zheng bo ma jin and womens singles is wang yihan, what was the tour?
SQL: SELECT "tour" FROM "winners" WHERE "mixed_doubles"='Zheng Bo Ma Jin' AND "womens_singles"='Wang Yihan';