The episode with production code 693-002, has how many original airdates?
CREATE TABLE "table1_26982362_2" (
  "no_in_series" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_airdate" text,
  "production_code" text
);
SELECT COUNT("original_airdate") FROM "table1_26982362_2" WHERE "production_code"='693-002';