CREATE TABLE "table1_20726262_4" (
  "no_in_series" real,
  "no_in_season" real,
  "title" text,
  "directedby" text,
  "writtenby" text,
  "originalairdate" text,
  "production_code" text,
  "u_s_viewers_million" text
);

Question: what i the maximum number in the series where the production code is 3wab07?
SQL: SELECT MAX("no_in_series") FROM "table1_20726262_4" WHERE "production_code"='3WAB07';

Question: what is the maximum number in the season wher the us viewers is 2.59?
SQL: SELECT MAX("no_in_season") FROM "table1_20726262_4" WHERE "u_s_viewers_million"='2.59';

Question: what is the written by and production code is 3wab03?
SQL: SELECT "writtenby" FROM "table1_20726262_4" WHERE "production_code"='3WAB03';