CREATE TABLE "table1_26259391_1" (
  "no_in_series" real,
  "no_in_season" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_air_date" text,
  "production_code" text,
  "u_s_viewers_million" text
);

Question: how many series had 6.55 u.s. viewers (million) and were directed by pete michels
SQL: SELECT COUNT("no_in_series") FROM "table1_26259391_1" WHERE "u_s_viewers_million"='6.55' AND "directed_by"='Pete Michels';

Question: how many series have production code 8acx05
SQL: SELECT "no_in_series" FROM "table1_26259391_1" WHERE "production_code"='8ACX05';

Question: how many u.s. viewers (million) have seen a production written by chris sheridan & danny smith
SQL: SELECT COUNT("u_s_viewers_million") FROM "table1_26259391_1" WHERE "written_by"='Chris Sheridan & Danny Smith';

Question: which production codes were written by andrew goldberg
SQL: SELECT "production_code" FROM "table1_26259391_1" WHERE "written_by"='Andrew Goldberg';

Question: Which production code had original air dated february20,2011
SQL: SELECT "production_code" FROM "table1_26259391_1" WHERE "original_air_date"='February20,2011';