CREATE TABLE "season_2009_10" (
  "date" text,
  "presenter" text,
  "guest_1" text,
  "guest_2" text,
  "guest_3" text,
  "guest_4" text
);

Question: How many people are guest 1 on episodes where guest 4 is Des Kelly?
SQL: SELECT COUNT("guest_1") FROM "season_2009_10" WHERE "guest_4"='Des Kelly';

Question: On episodes where guest 1 is Jim White, who was guest 3?
SQL: SELECT "guest_3" FROM "season_2009_10" WHERE "guest_1"='Jim White';