when did "unpleasantville" air?
CREATE TABLE "season_7_1998_1999" (
  "no_in_series" real,
  "no_in_season" real,
  "title" text,
  "director" text,
  "writer_s" text,
  "original_air_date" text,
  "production_code" text
);
SELECT "original_air_date" FROM "season_7_1998_1999" WHERE "title"='\"Unpleasantville\"';