CREATE TABLE "table1_12419515_4" (
  "series_num" real,
  "season_num" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_air_date" text,
  "total_viewers_in_millions" text
);

Question: What is the total number of titles written by Casey Johnson?
SQL: SELECT COUNT("title") FROM "table1_12419515_4" WHERE "written_by"='Casey Johnson';

Question: Who wrote the title that received 1.211 million total viewers?
SQL: SELECT "written_by" FROM "table1_12419515_4" WHERE "total_viewers_in_millions"='1.211';

Question: Who directed the title that was written by Adam Milch?
SQL: SELECT "directed_by" FROM "table1_12419515_4" WHERE "written_by"='Adam Milch';

Question: How many millions of total viewers watched series #57?
SQL: SELECT COUNT("total_viewers_in_millions") FROM "table1_12419515_4" WHERE "series_num"=57;

Question: How many millions of total viewers watched season #8?
SQL: SELECT "total_viewers_in_millions" FROM "table1_12419515_4" WHERE "season_num"=8;