CREATE TABLE "episodes" (
  "num" real,
  "air_date" text,
  "challenge" text,
  "winner" text,
  "test_taker" text,
  "passed" text
);

Question: Who took test #4?
SQL: SELECT "test_taker" FROM "episodes" WHERE "num"=4;

Question: What episode aired on 18 April 2007?
SQL: SELECT MIN("num") FROM "episodes" WHERE "air_date"='18 April 2007';

Question: Who had the challenge of night driving?
SQL: SELECT "test_taker" FROM "episodes" WHERE "challenge"='Night Driving';