What is the sum of Points, when Home is "Pittsburgh", when Date is "December 21", and when Attendance is greater than 5,307?
CREATE TABLE "game_log" (
  "date" text,
  "visitor" text,
  "score" text,
  "home" text,
  "attendance" real,
  "record" text,
  "points" real
);
SELECT SUM("points") FROM "game_log" WHERE "home"='pittsburgh' AND "date"='december 21' AND "attendance">'5,307';