本文為英文版的機器翻譯版本，如內容有任何歧義或不一致之處，概以英文版為準。

# \$1group
<a name="group"></a>

Amazon DocumentDB `$group` 中的彙總階段可讓您依指定的表達式將文件分組，並對分組的資料執行各種累積操作。這對於根據分組資料計算總計、平均值或其他統計資料等任務很有用。

**參數**
+ `_id`：指定輸入文件應分組的表達式。這可以是欄位名稱、運算表達式或兩者的組合。
+ `accumulator expressions`：（選用） 一或多個應套用至分組資料的累積器表達式。這些表達式使用上述的累積器運算子。

## 範例 (MongoDB Shell)
<a name="group-examples"></a>

下列範例依客戶的城市分組，並計算每個城市的總訂單金額。

**建立範例文件**

```
db.customers.insertMany([
  { name: "John Doe", city: "New York", orders: [{ amount: 100 }, { amount: 200 }] },
  { name: "Jane Smith", city: "Los Angeles", orders: [{ amount: 150 }, { amount: 300 }] },
  { name: "Bob Johnson", city: "New York", orders: [{ amount: 75 }, { amount: 125 }] },
  { name: "Samantha Lee", city: "Chicago", orders: [{ amount: 50 }, { amount: 100 }] }
]);
```

**查詢範例**

```
db.customers.aggregate([
  {
    $group: {
      _id: "$city",
      totalOrders: { $sum: { $sum: "$orders.amount" } }
    }
  }
]);
```

**輸出**

```
[
  { _id: 'Chicago', totalOrders: 150 },
  { _id: 'Los Angeles', totalOrders: 450 },
  { _id: 'New York', totalOrders: 500 }
]
```

## 程式碼範例
<a name="group-code"></a>

若要檢視使用 `$group`命令的程式碼範例，請選擇您要使用的語言標籤：

------
#### [ Node.js ]

```
const { MongoClient } = require('mongodb');

async function groupByCity() {
  const uri = 'mongodb://<username>:<password>@<cluster-endpoint>:27017/?tls=true&tlsCAFile=global-bundle.pem&replicaSet=rs0&readPreference=secondaryPreferred&retryWrites=false';
  const client = new MongoClient(uri);

  try {
    await client.connect();
    const db = client.db('test');
    const result = await db.collection('customers').aggregate([
      { $unwind: '$orders' },
      {
        $group: {
          _id: '$city',
          totalOrders: { $sum: '$orders.amount' }
        }
      }
    ]).toArray();

    console.log(result);
  } catch (err) {
    console.error('Error during aggregation:', err);
  } finally {
    await client.close();
  }
}

groupByCity();
```

------
#### [ Python ]

```
from pymongo import MongoClient

def group_by_city():
    client = MongoClient('mongodb://<username>:<password>@<cluster-endpoint>:27017/?tls=true&tlsCAFile=global-bundle.pem&replicaSet=rs0&readPreference=secondaryPreferred&retryWrites=false')
    
    try:
        db = client.test
        result = list(db.customers.aggregate([
            {'$unwind': '$orders'},
            {
                '$group': {
                    '_id': '$city',
                    'totalOrders': {'$sum': '$orders.amount'}
                }
            }
        ]))
        print(result)
    except Exception as e:
        print(f"Error during aggregation: {e}")
    finally:
        client.close()

group_by_city()
```

------