CREATE TABLE "250cc_classification" (
  "rider" text,
  "manufacturer" text,
  "laps" real,
  "time_retired" text,
  "grid" real
);

Question: What is the lowest number of laps for Marco Simoncelli on a grid higher than 11?
SQL: SELECT MIN("laps") FROM "250cc_classification" WHERE "rider"='marco simoncelli' AND "grid">11;

Question: Who is the rider who did less than 20 laps on a grid number greater than 23?
SQL: SELECT "rider" FROM "250cc_classification" WHERE "laps"<20 AND "grid">23;

Question: What is the lowest grid number that had a rider with KTM as the manufacturer who did more than 20 laps?
SQL: SELECT MIN("grid") FROM "250cc_classification" WHERE "manufacturer"='ktm' AND "laps">20;