Владимир

var items = JsonConvert.DeserializeObject<StructureTest[]>(ReciveData);

  foreach( var d in items ){
    Debug.Log($"id : {d.id}");
        Debug.Log($"Name: {d.Name}");
    }

select `authors`.`name`, `books`.`title`
  from `books`
  left join `authors` ON `authors`.`id` = `books`.`author_id`

select `authors`.`name`, count(`books`.`id`) as cnt
  from `books`, `authors`
  group by `books`.`author_id`
  having count(`books`.`id`) = 0

select `authors`.`name`, count(`books`.`id`) as cnt
  from `books`, `authors`
  group by `books`.`author_id`
  having count(`books`.`id`) > 1