CREATE TABLE "schedule" (
  "race" text,
  "length" text,
  "class" text,
  "circuit" text,
  "date" text
);

Question: Which circuit is on July 24?
SQL: SELECT "circuit" FROM "schedule" WHERE "date"='july 24';

Question: On which date was the GT class at Monterey Sports Car Grand Prix?
SQL: SELECT "date" FROM "schedule" WHERE "class"='gt' AND "race"='monterey sports car grand prix';

Question: What was the length for GT class at Portland International Raceway?
SQL: SELECT "length" FROM "schedule" WHERE "class"='gt' AND "circuit"='portland international raceway';

Question: On what date did Contac 12 Hours of Sebring take place?
SQL: SELECT "date" FROM "schedule" WHERE "race"='contac 12 hours of sebring';