What is the Rating/Share (18-49) that also has a Share greater than 10 and 12.42 million Viewers?
CREATE TABLE "us_nielsen_ratings" (
  "rating" real,
  "share" real,
  "rating_share_18_49" text,
  "viewers_millions" real,
  "rank_overall" text
);
SELECT "rating_share_18_49" FROM "us_nielsen_ratings" WHERE "share">10 AND "viewers_millions"=12.42;