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

Question: In what year did Carmen Worley win in the women's singles category?
SQL: SELECT "year" FROM "past_winners" WHERE "women_s_singles"='carmen worley';

Question: Who won in the men's doubles in 1980?
SQL: SELECT "men_s_doubles" FROM "past_winners" WHERE "year"='1980';

Question: Who won in mixed doubles in 2008?
SQL: SELECT "mixed_doubles" FROM "past_winners" WHERE "year"='2008';

Question: Who won women's double in 2002, the year that Kenneth Vella won men's singles?
SQL: SELECT "women_s_doubles" FROM "past_winners" WHERE "men_s_singles"='kenneth vella' AND "year"='2002';