On which date was the Winning score –5 (70-65-69-75=279)?
CREATE TABLE "european_tour_wins_8" (
  "date" text,
  "tournament" text,
  "winning_score" text,
  "margin_of_victory" text,
  "runner_s_up" text
);
SELECT "date" FROM "european_tour_wins_8" WHERE "winning_score"='–5 (70-65-69-75=279)';