What is the opening day net gross a Reliance Entertainment movie before 2011 had?
CREATE TABLE "biggest_opening_day_gross" (
  "rank" real,
  "movie" text,
  "year" real,
  "studio_s" text,
  "opening_day_net_gross" real,
  "day_of_week" text
);
SELECT SUM("opening_day_net_gross") FROM "biggest_opening_day_gross" WHERE "studio_s"='reliance entertainment' AND "year"<2011;