and { only { filter_greater { all_rows ; year ; 2005 } } ; eq { hop { filter_greater { all_rows ; year ; 2005 } ; version } ; live version ( recorded in 2006 ) } } = true
select the rows whose year record is greater than 2005 . there is only one such row in the table . the version record of this unqiue row is live version  recorded in 2006  .