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

4.0 版的新功能。

Amazon DocumentDB 中的`$sqrt`運算子用於計算數字的平方根。

**參數**
+ `expression`：引數可以是任何有效的表達式，只要解析為非負數即可。

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

下列範例示範運算`$sqrt`子用來計算數字平方根的用量。

**建立範例文件**

```
db.numbers.insertMany([
  { "_id": 1, "number": 16 },
  { "_id": 2, "number": 36 },
  { "_id": 3, "number": 64 }
]);
```

**查詢範例**

```
db.numbers.aggregate([
  { $project: {
    "_id": 1,
    "square_root": { $sqrt: "$number" }
  }}
]);
```

**輸出**

```
[
  { _id: 1, square_root: 4 },
  { _id: 2, square_root: 6 },
  { _id: 3, square_root: 8 }
]
```

## 程式碼範例
<a name="sqrt-code"></a>

若要檢視使用 `$sqrt`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 example() {
  const client = await MongoClient.connect('mongodb://<username>:<password>@<cluster-endpoint>:27017/?tls=true&tlsCAFile=global-bundle.pem&replicaSet=rs0&readPreference=secondaryPreferred&retryWrites=false');

  try {
      await client.connect();

      const db = client.db('test');
      const collection = db.collection('numbers');

      const pipeline = [
        {
          $project: {
            _id: 1,
            square_root: { $sqrt: '$number' }
          }
        }
      ];

      const results = await collection.aggregate(pipeline).toArray();

      console.dir(results, { depth: null });

    } finally {
      await client.close();
    }
}

example().catch(console.error);
```

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

```
from pymongo import MongoClient

def example():
  
  client = MongoClient('mongodb://<username>:<password>@<cluster-endpoint>:27017/?tls=true&tlsCAFile=global-bundle.pem&replicaSet=rs0&readPreference=secondaryPreferred&retryWrites=false')

  try:
      db = client.test
      collection = db.numbers

      pipeline = [
          {
              "$project": {
                  "_id": 1,
                  "square_root": { 
                    "$sqrt": "$number" 
                  }
              }
          }
      ]

      results = collection.aggregate(pipeline)

      for doc in results:
          print(doc)

  except Exception as e:
      print(f"An error occurred: {e}")

  finally:
      client.close()

example()
```

------