CREATE TABLE "results" (
  "driver" text,
  "entrant" text,
  "constructor" text,
  "time_retired" text,
  "grid" real
);

Question: What constructor has a grid less than 21, and time/retired of engine?
SQL: SELECT "constructor" FROM "results" WHERE "grid"<21 AND "time_retired"='engine';

Question: When the entrant is fred saunders what is the driver?
SQL: SELECT "driver" FROM "results" WHERE "entrant"='fred saunders';

Question: What's the lowest grid with and entrant of fred saunders?
SQL: SELECT MIN("grid") FROM "results" WHERE "entrant"='fred saunders';

Question: What is the time/retired for the driver emerson fittipaldi?
SQL: SELECT "time_retired" FROM "results" WHERE "driver"='emerson fittipaldi';