Name the least number for xle02007
CREATE TABLE "table1_28348757_3" (
  "no" real,
  "num" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_air_date" text,
  "production_code" text,
  "u_s_viewers_million" text
);
SELECT MIN("no") FROM "table1_28348757_3" WHERE "production_code"='XLE02007';