What is Partner, when Outcome is Winner, and when Date is 12 October 2003?
CREATE TABLE "doubles_5_2_3" (
  "outcome" text,
  "date" text,
  "tournament" text,
  "surface" text,
  "partner" text,
  "opponents" text,
  "score" text
);
SELECT "partner" FROM "doubles_5_2_3" WHERE "outcome"='winner' AND "date"='12 october 2003';