who is the constructor when the grid is more than 23 and the driver is piercarlo ghinzani?
CREATE TABLE "classification" (
  "driver" text,
  "constructor" text,
  "laps" real,
  "time_retired" text,
  "grid" real
);
SELECT "constructor" FROM "classification" WHERE "grid">23 AND "driver"='piercarlo ghinzani';