and { only { filter_eq { all_rows ; location ; las vegas , nevada , united states } } ; eq { hop { filter_eq { all_rows ; location ; las vegas , nevada , united states } ; opponent } ; rick roufus } } = true
select the rows whose location record fuzzily matches to las vegas , nevada , united states . there is only one such row in the table . the opponent record of this unqiue row is rick roufus .