CREATE TABLE "table1_2623498_5" (
  "episode_num" text,
  "season_episode_num" text,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_air_date" text,
  "prod_code" text
);

Question: What is the production code for episode #78?
SQL: SELECT "prod_code" FROM "table1_2623498_5" WHERE "episode_num"='78';

Question: What is the number of titles written by Charleen Easton?
SQL: SELECT COUNT("title") FROM "table1_2623498_5" WHERE "written_by"='Charleen Easton';

Question: What is the number of production codes for episode #73?
SQL: SELECT COUNT("prod_code") FROM "table1_2623498_5" WHERE "episode_num"='73';

Question: What is the number of air dates titled "The Big Job"?'
SQL: SELECT COUNT("original_air_date") FROM "table1_2623498_5" WHERE "title"='\"The Big Job\"';