CREATE TABLE "series_4" (
  "episode_no" real,
  "airdate" text,
  "total_viewers" real,
  "share" text,
  "bbc_one_weekly_ranking" real
);

Question: What date did the episode with a weekly ranking of 14 air?
SQL: SELECT "airdate" FROM "series_4" WHERE "bbc_one_weekly_ranking"=14;

Question: What is the total number of total viewers with a share of 18.8% and a weekly ranking under 16?
SQL: SELECT COUNT("total_viewers") FROM "series_4" WHERE "share"='18.8%' AND "bbc_one_weekly_ranking"<16;