and { only { filter_less { all_rows ; elevation ( m ) ; 2400 } } ; eq { hop { filter_less { all_rows ; elevation ( m ) ; 2400 } ; peak } ; pietrosul rodnei } } = true
select the rows whose elevation  m  record is less than 2400 . there is only one such row in the table . the peak record of this unqiue row is pietrosul rodnei .