Table: dragons_den_episodes
Columns: episode
first_aired
entrepreneur_s
company_or_product_name
money_requested
investing_dragon_s

Question: how much money was requested on the show which aired on 4 september 2011?
SQL: SELECT SUM("money_requested") FROM dragons_den_episodes WHERE "first_aired" = '4 september 2011'

Question: what investing dragons aired on episode 10?
SQL: SELECT "investing_dragon_s" FROM dragons_den_episodes WHERE "episode" = 'episode 10'