and { only { filter_eq { all_rows ; population ( 1 july 2005 est ) ; 0 } } ; eq { hop { filter_eq { all_rows ; population ( 1 july 2005 est ) ; 0 } ; subdivisions } ; redonda } } = true
select the rows whose population  1 july 2005 est  record is equal to 0 . there is only one such row in the table . the subdivisions record of this unqiue row is redonda .