如何反转 MQL 查询（对于 freebase）？

Question

我正在尝试列出特定 ID 的所有类型：

{
  "id": "/en/sony",
  "type": [{
    "name": "Topic",
    "id": null
  }]
}

这个查询给我以下结果： http://tinyurl.com/lubavey

{
  "result": {
    "type": [
      {
        "id": "/common/topic",
        "name": "Topic"
      },
      {
        "id": "/base/audiobase/topic",
        "name": "Topic"
      },
      {
        "id": "/base/fblinux/topic",
        "name": "Topic"
      },
      {
        "id": "/base/digitalcameras/topic",
        "name": "Topic"
      },
      {
        "id": "/base/popstra/topic",
        "name": "Topic"
      },
      {
        "id": "/base/televisions/topic",
        "name": "Topic"
      },
      {
        "id": "/base/ps3games/topic",
        "name": "Topic"
      },
      {
        "id": "/base/filmcameras/topic",
        "name": "Topic"
      },
      {
        "id": "/m/04mny2g",
        "name": "Topic"
      }
    ],
    "id": "/en/sony"
  }
}

我想要完全相反的结果。我想要所有没有名称为 "Topic" 的类型。我怎样才能做到这一点？我尝试将 ! 运算符与 MQL 参考指南中建议的属性 name 一起使用，但它给了我错误：

"Can't use unqualified property names with ! reversing".

我应该怎么做才能消除 ! 的错误并获得相反的查询结果？

Answer 1

试试 !=:

{
  "id": "/en/sony",
  "type": [{
    "name!=": "Topic",
    "id": null
  }]
}

The != operator says that the constrained property can be anything but the specified value. (It does require that the property be something, however: it does not match object for which the property is null.)

在此处阅读有关 != 运算符的更多信息：http://wiki.freebase.com/wiki/MQL_operators#The_.22but_not.22_Operator_.21.3D

如何反转 MQL 查询（对于 freebase）？

How to invert the MQL query (for freebase)?

api

error-handling

reverse

freebase

mql