Table: challenge_results
Columns: episode_number
location
original_airdate
challenge_winner
challenge

Question: What is the original airdate of the episode where the challenge was three overstuffed sandwiches? 
SQL: SELECT "original_airdate" FROM challenge_results WHERE "challenge" = 'Three overstuffed sandwiches'

Question: Who was the challenge winner in the episode that originally aired on January 28, 2009?
SQL: SELECT "challenge_winner" FROM challenge_results WHERE "original_airdate" = 'January 28, 2009'

Question: What is the original airdate of the episode where the challenge is "Southwestern Exposure", a twelve-egg omelette"?
SQL: SELECT "original_airdate" FROM challenge_results WHERE "challenge" = '"Southwestern Exposure", a twelve-egg omelette'

Question: How many episodes had New York, New York as the location?
SQL: SELECT COUNT("episode_number") FROM challenge_results WHERE "location" = 'New York, New York'

Question: What is the original airdate of the episode where the challenge is a "7-pound monster breakfast burrito"?
SQL: SELECT "original_airdate" FROM challenge_results WHERE "challenge" = '"7-pound monster breakfast burrito"'