CREATE TABLE "table1_23937219_3" (
  "series_num" real,
  "season_num" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_air_date" text,
  "prod_code" real
);

Question: How many people directed "through the looking glass"?
SQL: SELECT COUNT("directed_by") FROM "table1_23937219_3" WHERE "title"='\"Through The Looking Glass\"';

Question: How many people directed episode 7 In the season?
SQL: SELECT COUNT("directed_by") FROM "table1_23937219_3" WHERE "season_num"=7;

Question: How many original air dates were there for the episode with production code 212?
SQL: SELECT COUNT("original_air_date") FROM "table1_23937219_3" WHERE "prod_code"=212;

Question: What is the  production code for "road trip (aka "the kiss")"?
SQL: SELECT "prod_code" FROM "table1_23937219_3" WHERE "title"='\"Road Trip (aka \"The Kiss\")\"';

Question: What is the production code for episode 31 in the series?
SQL: SELECT MIN("prod_code") FROM "table1_23937219_3" WHERE "series_num"=31;