NESTED TABLE
{ nested_item | COLUMN_VALUE }
[ substitutable_column_clause ]
STORE AS storage_table
[ ( { (object_properties)
    | [ physical_properties ]
    | [ column_properties ]
    }
      [ (object_properties)
      | [ physical_properties ]
      | [ column_properties ]
      ]...
  )
]
[ RETURN AS { LOCATOR | VALUE } ]