Neo4j 如何在节点子节点（而不是其父节点）上使用ORDER BY和LIMIT？密码

我有一组

作者

节点。

Author

节点是多个

Book

节点的单亲

我的目标是：打印所有

Author

节点，无顺序、无限制，每个作者的前三本书按字母顺序排列

所需输出：（让我们假设书名是一个字母）

我的问题： 我试过这个：

MATCH(author:Author)
WITH author

OPTIONAL MATCH(author)-[:WROTE]->(book:Book)
WITH author, book
ORDER BY book.name
LIMIT 3

WITH author, collect(book) AS books
RETURN collect (
  {
    name: author.name,
    books: books
  }
);

但这给了：

[
  {
    "name" : "Leo Tolstoy",
    "books": [
      { "name": "A" },
      { "name": "B" },
    ]
  },

  {
    "name": "Charles Dickens",
    "books": [
      { "name": "C" }
    ]
  }
]

如何在Neo4j v3.5中实现所需的输出？

[编辑]

这应该起作用：

MATCH(author:Author)
OPTIONAL MATCH(author)-[:WROTE]->(book:Book)
WITH author, book.name AS bookName
ORDER BY bookName
WITH author, COLLECT({name: bookName})[..3] AS bookNames
RETURN COLLECT({name: author.name, books: bookNames}) AS result

---

您需要在可选匹配和collect之间进行排序，但这是可行的。这是适用于本案例的几种方法之一，此知识库条目涵盖了其他方法：谢谢！我知道如何限制每个作者的书单。但是，如何在这个查询中对图书名称进行排序？我试着把

按书名排序

放在第三行之后，但这似乎没有改变任何事情。我已经更新了答案，以便对书名进行排序。

MATCH(author:Author)
OPTIONAL MATCH(author)-[:WROTE]->(book:Book)
WITH author, book.name AS bookName
ORDER BY bookName
WITH author, COLLECT({name: bookName})[..3] AS bookNames
RETURN COLLECT({name: author.name, books: bookNames}) AS result