On what Date was the Winning score –8 (69-72-70-69=280)?
CREATE TABLE "lpga_tour_wins_7" (
  "date" text,
  "tournament" text,
  "winning_score" text,
  "margin_of_victory" text,
  "runner_s_up" text
);
SELECT "date" FROM "lpga_tour_wins_7" WHERE "winning_score"='–8 (69-72-70-69=280)';