CREATE TABLE "race_calendar_and_winners" (
  "round" real,
  "race" text,
  "circuit" text,
  "date" text,
  "event" text,
  "winning_driver" text
);

Question: What shows for round when the race was Int. Adac Preis Von Zweibrücken?
SQL: SELECT "round" FROM "race_calendar_and_winners" WHERE "race"='int. adac preis von zweibrücken';

Question: What is the round for the Norisring circuit?
SQL: SELECT AVG("round") FROM "race_calendar_and_winners" WHERE "circuit"='norisring';

Question: What race was a round smaller than 8,  on 6 july?
SQL: SELECT "race" FROM "race_calendar_and_winners" WHERE "round"<8 AND "date"='6 july';

Question: What is the round for the Int. Adac-Preis Der Tourenwagen Von Sachsen-Anhalt?
SQL: SELECT "round" FROM "race_calendar_and_winners" WHERE "race"='int. adac-preis der tourenwagen von sachsen-anhalt';