and { only { filter_eq { filter_greater { all_rows ; gold ; 0 } ; bronze ; 2 } } ; eq { hop { filter_eq { filter_greater { all_rows ; gold ; 0 } ; bronze ; 2 } ; nation } ; soviet union ( urs ) } } = true
select the rows whose gold record is greater than 0 . among these rows , select the rows whose bronze record is equal to 2 . there is only one such row in the table . the nation record of this unqiue row is soviet union  urs  .