CREATE TABLE "classification" (
  "driver" text,
  "constructor" text,
  "laps" real,
  "time_retired" text,
  "grid" real
);

Question: What was the Vanwall time/retired with 49 laps?
SQL: SELECT "time_retired" FROM "classification" WHERE "laps"=49 AND "constructor"='vanwall';

Question: How many laps did the grid 1 engine have?
SQL: SELECT SUM("laps") FROM "classification" WHERE "time_retired"='engine' AND "grid"=1;

Question: What was the highest lap for Luigi Piotti with more than 13 grid and a time/retired engine?
SQL: SELECT MAX("laps") FROM "classification" WHERE "grid">13 AND "time_retired"='engine' AND "driver"='luigi piotti';