CREATE TABLE "polish_open" (
  "year_location" text,
  "mens_singles" text,
  "womens_singles" text,
  "mens_doubles" text,
  "womens_doubles" text
);

Question: Who won the mens doubles when wu yang won the womens singles?
SQL: SELECT "mens_doubles" FROM "polish_open" WHERE "womens_singles"='Wu Yang';

Question: What year and where was the tournament when fan ying won the womens singles?
SQL: SELECT "year_location" FROM "polish_open" WHERE "womens_singles"='Fan Ying';

Question: Who won the mens singles when lau sui fei won the womens singles?
SQL: SELECT "mens_singles" FROM "polish_open" WHERE "womens_singles"='Lau Sui Fei';

Question: Who won the mens doubles when wang hao won the mens singles?
SQL: SELECT "mens_doubles" FROM "polish_open" WHERE "mens_singles"='Wang Hao';