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

Question: Who won Mixed Doubles the year that Marija Ulitina won the Women's Singles?
SQL: SELECT "mixed_doubles" FROM "previous_winners" WHERE "women_s_singles"='marija ulitina';

Question: Who won Men's singles the year that Hilde Themel won Women's singles?
SQL: SELECT "men_s_singles" FROM "previous_winners" WHERE "women_s_singles"='hilde themel';

Question: Who won Mixed doubles the year that Pablo Abian won Men's singles?
SQL: SELECT "mixed_doubles" FROM "previous_winners" WHERE "men_s_singles"='pablo abian';