CREATE TABLE "singles_12_8_4" (
  "outcome" text,
  "no" text,
  "date" text,
  "championship" text,
  "surface" text,
  "opponent_in_the_final" text,
  "score_in_the_final" text
);

Question: Where the outcome is Winner and surface is Hard (i), what is the No.?
SQL: SELECT "no" FROM "singles_12_8_4" WHERE "outcome"='Winner' AND "surface"='Hard (i)';

Question: On the date October 21, 2007, what is the No.?
SQL: SELECT "no" FROM "singles_12_8_4" WHERE "date"='October 21, 2007';

Question: Where is the championship where 6–1, 3–6, 3–6 is the score in the final?
SQL: SELECT "championship" FROM "singles_12_8_4" WHERE "score_in_the_final"='6–1, 3–6, 3–6';

Question: When the  score in the final is 3–6, 6–4, 3–6, 4–6, who are all the opponents in the final?
SQL: SELECT "opponent_in_the_final" FROM "singles_12_8_4" WHERE "score_in_the_final"='3–6, 6–4, 3–6, 4–6';

Question: The score in the final is 2–6, 6–2, 6–0, on what surface?
SQL: SELECT "surface" FROM "singles_12_8_4" WHERE "score_in_the_final"='2–6, 6–2, 6–0';