What was the margin of victory on Mar 18, 1979?
CREATE TABLE "pga_tour_wins_10" (
  "date" text,
  "tournament" text,
  "winning_score" text,
  "margin_of_victory" text,
  "runner_up" text
);
SELECT "margin_of_victory" FROM "pga_tour_wins_10" WHERE "date"='mar 18, 1979';