How long did it take for the rider of a Yamaha with a grid less than 8 and laps less than 23?
CREATE TABLE "moto_gp_classification" (
  "rider" text,
  "manufacturer" text,
  "laps" real,
  "time" text,
  "grid" real
);
SELECT "time" FROM "moto_gp_classification" WHERE "manufacturer"='yamaha' AND "grid"<8 AND "laps"<23;