CREATE TABLE "table1_18012738_1" (
  "story_no" text,
  "episode" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "uk_viewers_million" text,
  "ai_pct" real,
  "original_air_date" text,
  "production_code" text
);

Question: Name the original air date for ai% for 83
SQL: SELECT "original_air_date" FROM "table1_18012738_1" WHERE "ai_pct"=83;

Question: Name the story number for paul cornell
SQL: SELECT "story_no" FROM "table1_18012738_1" WHERE "written_by"='Paul Cornell';

Question: Name the total number directed by for uk viewers being 6.86
SQL: SELECT COUNT("directed_by") FROM "table1_18012738_1" WHERE "uk_viewers_million"='6.86';

Question: Name the least ai %
SQL: SELECT MIN("ai_pct") FROM "table1_18012738_1";