Table: world_record_200m
Columns: time
athlete
nationality
location_of_race
date

Question: What's the nationality of Henry Carr having a time of 20.3y?
SQL: SELECT "nationality" FROM world_record_200m WHERE "athlete" = 'henry carr' AND "time" = '20.3y'

Question: What's the nationality of Livio Berruti?
SQL: SELECT "nationality" FROM world_record_200m WHERE "athlete" = 'livio berruti'

Question: What's the nationality of Ray norton with a time of 20.6?
SQL: SELECT "nationality" FROM world_record_200m WHERE "time" = '20.6' AND "athlete" = 'ray norton'