CREATE TABLE "table1_2226817_6" (
  "no_in_series" real,
  "no_in_season" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_air_date" text,
  "production_code" text
);

Question: When did the episode titled "Route 666 (part 1)" air for the first time?
SQL: SELECT "original_air_date" FROM "table1_2226817_6" WHERE "title"='\"Route 666 (Part 1)\"';

Question: What's the season number of the episode with series number 84?
SQL: SELECT MIN("no_in_season") FROM "table1_2226817_6" WHERE "no_in_series"=84;

Question: How many season numbers are there for the episodes written by Art Everett?
SQL: SELECT COUNT("no_in_season") FROM "table1_2226817_6" WHERE "written_by"='Art Everett';

Question: How many series numbers do the episodes originally aired on October 28, 1990?
SQL: SELECT COUNT("no_in_series") FROM "table1_2226817_6" WHERE "original_air_date"='October 28, 1990';

Question: What' the series number of the episode with season number 13?
SQL: SELECT MIN("no_in_series") FROM "table1_2226817_6" WHERE "no_in_season"=13;