CREATE TABLE "table1_23117208_4" (
  "no_in_series" real,
  "no_in_season" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_air_date" text,
  "prod_code" text,
  "viewers_millions" text
);

Question: Name the production code for 4.92 million viewers
SQL: SELECT "prod_code" FROM "table1_23117208_4" WHERE "viewers_millions"='4.92';

Question: Name the least number in season for jessica ball
SQL: SELECT MIN("no_in_season") FROM "table1_23117208_4" WHERE "written_by"='Jessica Ball';