Freebase MQL 过滤器的值！= null？

发布于 2024-07-15 20:46:00 字数 896 浏览 10 评论 0原文

我正在尝试编写一个过滤掉空值的 MQL 查询。

我现在的查询（可以使用 MQL 查询编辑器执行）：

[
  {
    "/common/topic/image" : [
      {
        "id" : null
      }
    ],
    "article" : [
      {
        "content" : null
      }
    ],
    "name" : "bill gates",
    "type" : "/common/topic"
  }
]

我得到的结果：

[
  {
    "/common/topic/image" : [
      {
        "id" : "/guid/9202a8c04000641f8000000004fb4c01"
      },
      {
        "id" : "/wikipedia/images/commons_id/4486276"
      }
    ],
    "article" : [
      {
        "content" : null
      },
      {
        "content" : "/guid/9202a8c04000641f800000000903535d"
      }
    ],
    "name" : "Bill Gates",
    "type" : "/common/topic"
  }
]

我试图弄清楚如何在查询时过滤掉“article”数组中的“content”：null 匹配。我浏览了 MQL 文档，但没有找到明确的方法来执行此操作。

原文

I'm trying to write an MQL query that filters out null values.

The query I have now (can be executed using the MQL Query Editor):

[
  {
    "/common/topic/image" : [
      {
        "id" : null
      }
    ],
    "article" : [
      {
        "content" : null
      }
    ],
    "name" : "bill gates",
    "type" : "/common/topic"
  }
]

The results I am getting:

[
  {
    "/common/topic/image" : [
      {
        "id" : "/guid/9202a8c04000641f8000000004fb4c01"
      },
      {
        "id" : "/wikipedia/images/commons_id/4486276"
      }
    ],
    "article" : [
      {
        "content" : null
      },
      {
        "content" : "/guid/9202a8c04000641f800000000903535d"
      }
    ],
    "name" : "Bill Gates",
    "type" : "/common/topic"
  }
]

I'm trying to figure out how I can filter out the "content" : null match in the "article" array at query time. I looked through the MQL documentation but I didn't see a clear way to do this.

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诗酒趁年少 2024-07-22 20:46:00

要过滤掉没有分配任何内容的文章，您必须扩展内容 id 属性并将可选指令设置为 false。

[
  {
    "/common/topic/image" : [
      {
        "id" : null
      }
    ],
    "article" : [
      {
        "content" : {
          "id" : null,
          "optional" : false
        }
      }
    ],
    "name" : "bill gates",
    "type" : "/common/topic"
  }
]

这将为您提供以下结果：

[
  {
    "/common/topic/image" : [
      {
        "id" : "/guid/9202a8c04000641f8000000004fb4c01"
      },
      {
        "id" : "/wikipedia/images/commons_id/4486276"
      }
    ],
    "article" : [
      {
        "content" : {
          "id" : "/guid/9202a8c04000641f800000000903535d"
        }
      }
    ],
    "name" : "Bill Gates",
    "type" : "/common/topic"
  }
]

有关使用可选指令的更多信息，请参阅文档此处。

To filter out articles that don't have any content assigned to them you'll have to expand the content id attribute and set the optional directive to false.

[
  {
    "/common/topic/image" : [
      {
        "id" : null
      }
    ],
    "article" : [
      {
        "content" : {
          "id" : null,
          "optional" : false
        }
      }
    ],
    "name" : "bill gates",
    "type" : "/common/topic"
  }
]

This will give you the following result:

[
  {
    "/common/topic/image" : [
      {
        "id" : "/guid/9202a8c04000641f8000000004fb4c01"
      },
      {
        "id" : "/wikipedia/images/commons_id/4486276"
      }
    ],
    "article" : [
      {
        "content" : {
          "id" : "/guid/9202a8c04000641f800000000903535d"
        }
      }
    ],
    "name" : "Bill Gates",
    "type" : "/common/topic"
  }
]

For more information about using the optional directive see the documentation here.

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