and { only { filter_eq { all_rows ; score ; 0 - 0 } } ; and { eq { hop { filter_eq { all_rows ; score ; 0 - 0 } ; home team } ; port vale } ; eq { hop { filter_eq { all_rows ; score ; 0 - 0 } ; away team } ; watford } } } = true
select the rows whose score record fuzzily matches to 0  0 . there is only one such row in the table . the home team record of this unqiue row is port vale . the away team record of this unqiue row is watford .