CREATE TABLE "records" (
  "date" text,
  "event" text,
  "heat_semifinal_final" text,
  "nation" text,
  "time" text
);

Question: What nation has a time of 51.35 in the final heat?
SQL: SELECT "nation" FROM "records" WHERE "time"='51.35' AND "heat_semifinal_final"='final';

Question: Which heat, semifinal or final has a time of 48.97?
SQL: SELECT "heat_semifinal_final" FROM "records" WHERE "time"='48.97';

Question: What heat, semifinal or final has a time of 25.00?
SQL: SELECT "heat_semifinal_final" FROM "records" WHERE "time"='25.00';

Question: What date was the men's 100m breaststroke in heat 6?
SQL: SELECT "date" FROM "records" WHERE "event"='men''s 100m breaststroke' AND "heat_semifinal_final"='heat 6';