What was the least amount of points scored by the golden bears when the opponent scored 15 points?
CREATE TABLE "schedule" (
  "game" real,
  "date" text,
  "opponent" text,
  "result" text,
  "golden_bears_points" real,
  "opponents" real,
  "record" text
);
SELECT MIN("golden_bears_points") FROM "schedule" WHERE "opponents"=15;