and { only { filter_eq { all_rows ; result ; 1st } } ; and { eq { hop { filter_eq { all_rows ; result ; 1st } ; tournament } ; european championships } ; eq { hop { filter_eq { all_rows ; result ; 1st } ; extra } ; 400 m } } } = true
select the rows whose result record fuzzily matches to 1st . there is only one such row in the table . the tournament record of this unqiue row is european championships . the extra record of this unqiue row is 400 m .