CREATE TABLE "achievements" (
  "year" real,
  "tournament" text,
  "venue" text,
  "result" text,
  "extra" text
);

Question: what is the result when extra is 4 x 100 m relay and the year is later than 1971?
SQL: SELECT "result" FROM "achievements" WHERE "extra"='4 x 100 m relay' AND "year">1971;

Question: what is the venue when the result is 2nd and extra is 4 x 100 m relay?
SQL: SELECT "venue" FROM "achievements" WHERE "result"='2nd' AND "extra"='4 x 100 m relay';