and { only { filter_eq { all_rows ; crystal structure ; orthorhombic } } ; eq { hop { filter_eq { all_rows ; crystal structure ; orthorhombic } ; formula } ; yba 2 cu 3 o 7 } } = true
select the rows whose crystal structure record fuzzily matches to orthorhombic . there is only one such row in the table . the formula record of this unqiue row is yba 2 cu 3 o 7 .