CREATE TABLE "calendar" (
  "round" real,
  "circuit" text,
  "date" text,
  "length" text,
  "pole_position" text,
  "gt3_winner" text,
  "gt4_winner" text
);

Question: When  david ashburn richard westbrook is the gt3 winner and 1 is the round what is the length?
SQL: SELECT "length" FROM "calendar" WHERE "round"=1 AND "gt3_winner"='David Ashburn Richard Westbrook';

Question: When charles bateman michael lyons is the gt3 winner and donington park is the circuit who is the gt4 winner?
SQL: SELECT "gt4_winner" FROM "calendar" WHERE "circuit"='Donington Park' AND "gt3_winner"='Charles Bateman Michael Lyons';

Question: When charles bateman michael lyons is the gt3 winner and 9 is the round who is the gt4 winner?
SQL: SELECT "gt4_winner" FROM "calendar" WHERE "round"=9 AND "gt3_winner"='Charles Bateman Michael Lyons';

Question: When  tim bridgman gregor fisken is the pole position who is the gt3 winner?
SQL: SELECT "gt3_winner" FROM "calendar" WHERE "pole_position"='Tim Bridgman Gregor Fisken';