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MongoDB 聚合 $sort


聚合 $sort

此聚合阶段对所有文档进行分组,并按照指定的排序顺序进行排序。

请记住,阶段的顺序很重要。每个阶段仅对先前阶段提供的文档进行操作。

示例

在此示例中,我们使用从“聚合简介”部分的示例数据加载的“sample_airbnb”数据库。

db.listingsAndReviews.aggregate([ 
  { 
    $sort: { "accommodates": -1 } 
  },
  {
    $project: {
      "name": 1,
      "accommodates": 1
    }
  },
  {
    $limit: 5
  }
])
自己尝试 »

这将返回按 accommodates 字段降序排序的文档。

可以使用 1-1 选择排序顺序。1 表示升序,-1 表示降序。


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