Question: What players played mixed doubles when Zhang Xi played mixed singles?
SQL: SELECT "Mixed doubles" FROM "2-12121208-1" WHERE "Women's singles" = 'Zhang Xi';

Question: What player played women's singles when Marcus Ellis Heather Olver played mixed doubles?
SQL: SELECT "Women's singles" FROM "2-12121208-1" WHERE "Mixed doubles" = 'Marcus Ellis Heather Olver';

Question: What player played women's doubles when Lee Jae-jin Lee Eun-woo played mixed doubles?
SQL: SELECT "Women's doubles" FROM "2-12121208-1" WHERE "Mixed doubles" = 'Lee Jae-jin Lee Eun-woo';

Question: What year did Helle Nielsen Marie Røpke play womens' doubles?
SQL: SELECT "Year" FROM "2-12121208-1" WHERE "Women's doubles" = 'Helle Nielsen Marie Røpke';

Question: What is the latest year that Chou Tien-chen played men's singles?
SQL: SELECT MAX("Year") FROM "2-12121208-1" WHERE "Men's singles" = 'Chou Tien-chen';