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

Amazon DocumentDB 中的`$setEquals`运算符用于确定两组是否相等。它比较两个数组，并返回它们`true`是否包含相同的不同元素，无论它们的顺序如何。

**参数**
+ `expression1`: 第一个要比较的数组。
+ `expression2`: 第二个要比较的数组。

## 示例（MongoDB 外壳）
<a name="setEquals-examples"></a>

以下示例演示如何使用运`$setEquals`算符比较两组值。

**创建示例文档**

```
db.collection.insertMany([
  { _id: 1, fruits: ["apple", "banana", "cherry"] },
  { _id: 2, fruits: ["banana", "apple", "cherry"] },
  { _id: 3, fruits: ["apple", "banana", "orange"] }
])
```

**查询示例**

```
db.collection.find({
  $expr: {
    $setEquals: ["$fruits", ["apple", "banana", "cherry"]]
  }
})
```

**输出**

```
{ "_id" : 1, "fruits" : [ "apple", "banana", "cherry" ] }
{ "_id" : 2, "fruits" : [ "banana", "apple", "cherry" ] }
```

该查询使用`$setEquals`运算符将每个文档的`fruits`字段与数组进行比较`[&quot;apple&quot;, &quot;banana&quot;, &quot;cherry&quot;]`。返回该`fruits`字段等于比较数组的文档。

## 代码示例
<a name="setEquals-code"></a>

要查看使用该`$setEquals`命令的代码示例，请选择要使用的语言的选项卡：

------
#### [ 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');
  const db = client.db('test');
  const collection = db.collection('mycollection');

  // Insert sample documents
  await collection.insertMany([
    { _id: 1, fruits: ["apple", "banana", "cherry"] },
    { _id: 2, fruits: ["banana", "apple", "cherry"] },
    { _id: 3, fruits: ["apple", "banana", "orange"] }
  ]);

  // Query using $setEquals
  const result = await collection.find({
    $expr: {
      $setEquals: ["$fruits", ["apple", "banana", "cherry"]]
    }
  }).toArray();

  console.log(result);
  await client.close();
}

example();
```

------
#### [ 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')
    db = client['test']
    collection = db['mycollection']

    # Insert sample documents
    collection.insert_many([
        {"_id": 1, "fruits": ["apple", "banana", "cherry"]},
        {"_id": 2, "fruits": ["banana", "apple", "cherry"]},
        {"_id": 3, "fruits": ["apple", "banana", "orange"]}
    ])

    # Query using $setEquals
    result = list(collection.find({
        "$expr": {
            "$setEquals": ["$fruits", ["apple", "banana", "cherry"]]
        }
    }))

    print(result)
    client.close()

example()
```

------