Question: Find the names of the swimmers who have both "win" and "loss" results in the record.
SQL: SELECT t1.name FROM swimmer AS t1 JOIN record AS t2 ON t1.id  =  t2.swimmer_id WHERE RESULT  =  'Win' INTERSECT SELECT t1.name FROM swimmer AS t1 JOIN record AS t2 ON t1.id  =  t2.swimmer_id WHERE RESULT  =  'Loss'