Question: What nation has a time of 51.35 in the Final heat?
SQL: SELECT "Nation" FROM "2-18565896-4" 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 "2-18565896-4" WHERE "Time" = '48.97';

Question: What heat, semifinal or final has a time of 25.00?
SQL: SELECT "Heat/Semifinal/Final" FROM "2-18565896-4" WHERE "Time" = '25.00';

Question: What date was the Men's 100m breaststroke in Heat 6?
SQL: SELECT "Date" FROM "2-18565896-4" WHERE "Event" = 'Men''s 100m breaststroke' AND "Heat/Semifinal/Final" = 'Heat 6';