What is the margin of victory of the tournament on 5 Jun 1988?
CREATE TABLE "lpga_tour_20" (
  "date" text,
  "tournament" text,
  "winning_score" text,
  "margin_of_victory" text,
  "runner_s_up" text
);
SELECT "margin_of_victory" FROM "lpga_tour_20" WHERE "date"='5 jun 1988';