CREATE TABLE "125cc_classification" (
  "rider" text,
  "manufacturer" text,
  "laps" real,
  "time" text,
  "grid" real
);

Question: Can you tell me the Manufacturer that has the Rider of stefan bradl?
SQL: SELECT "manufacturer" FROM "125cc_classification" WHERE "rider"='stefan bradl';

Question: Can you tell me the highest Grid that has the Time of +15.532, and the Laps larger than 23?
SQL: SELECT MAX("grid") FROM "125cc_classification" WHERE "time"='+15.532' AND "laps">23;

Question: Can you tell me the sum of Grid that has the Time of +6.355, and the Laps larger than 23?
SQL: SELECT SUM("grid") FROM "125cc_classification" WHERE "time"='+6.355' AND "laps">23;