CREATE TABLE "ratings" (
  "episode" text,
  "air_date" text,
  "official_itv1_rating" real,
  "weekly_rank" text,
  "share" text
);

Question: What is the Official ITV1 rating for auditions 4?
SQL: SELECT "official_itv1_rating" FROM "ratings" WHERE "episode"='auditions 4';

Question: What is the lowest official ITV1 rating with 45.4% share?
SQL: SELECT MIN("official_itv1_rating") FROM "ratings" WHERE "share"='45.4%';