需要显示mongoDb集合中填充了多少数据(以百分比为单位

db.collection.aggregate([
  {
    $group: {
      _id: null,
      totalDocuments: { $sum: 1 }
    }
  },
  {
    $project: {
      _id: 0,
      filledPercentage: {
        $multiply: [
          { $divide: [ filledDocumentsCount, "$totalDocuments" ] },
          100
        ]
      }
    }
  },
  {
    $project: {
      filledPercentage: { $round: [ "$filledPercentage", 2 ] }
    }
  }
])