What date was the result 6–2, 4–6, 6–4?
CREATE TABLE "doubles_7" (
  "edition" text,
  "round" text,
  "date" text,
  "partnering" text,
  "against" text,
  "surface" text,
  "opponents" text,
  "w_l" text,
  "result" text
);
SELECT "date" FROM "doubles_7" WHERE "result"='6–2, 4–6, 6–4';