Name the sum of rating % for cctv and position more than 7
CREATE TABLE "most_viewed_channels" (
  "position" real,
  "channel" text,
  "owner" text,
  "share_pct" real,
  "rating_pct" real
);
SELECT SUM("rating_pct") FROM "most_viewed_channels" WHERE "owner"='cctv' AND "position">7;