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: What year had a Women's doubles and Women's singles with no competition?
SQL: SELECT "year" FROM "previous_winners" WHERE "women_s_doubles"='no competition' AND "women_s_singles"='no competition';

Question: The year the Women's singles was won by Christine Magnusson who was the winner of the Men's singles?
SQL: SELECT "men_s_singles" FROM "previous_winners" WHERE "women_s_singles"='christine magnusson';

Question: In 1982, when the Men's doubles had no competition who won the Women's singles?
SQL: SELECT "women_s_singles" FROM "previous_winners" WHERE "men_s_doubles"='no competition' AND "year"='1982';

Question: When Steve Baddeley won the Men's singles who won the Women's singles?
SQL: SELECT "women_s_singles" FROM "previous_winners" WHERE "men_s_singles"='steve baddeley';

Question: When Marja Ridder won the Women's singles who won the Men's singles?
SQL: SELECT "men_s_singles" FROM "previous_winners" WHERE "women_s_singles"='marja ridder';