CREATE TABLE "records_1951_1976" (
  "time" text,
  "athlete" text,
  "nationality" text,
  "location_of_race" text,
  "date" text
);

Question: What's the nationality of Henry Carr having a time of 20.3y?
SQL: SELECT "nationality" FROM "records_1951_1976" WHERE "athlete"='henry carr' AND "time"='20.3y';

Question: What's the nationality of Livio Berruti?
SQL: SELECT "nationality" FROM "records_1951_1976" WHERE "athlete"='livio berruti';

Question: What's the nationality of Ray norton with a time of 20.6?
SQL: SELECT "nationality" FROM "records_1951_1976" WHERE "time"='20.6' AND "athlete"='ray norton';