$ne - Amazon DocumentDB
Example (MongoDB Shell)Code examples

$ne

The $ne aggregation operator compares two values and returns true if they are not equal, otherwise returns false.

Parameters

  • expression1: The first value to compare.

  • expression2: The second value to compare.

Example (MongoDB Shell)

The following example demonstrates using the $ne operator to identify orders with status changes.

Create sample documents

db.orders.insertMany([
  { _id: 1, orderId: "A123", status: "shipped", expectedStatus: "shipped" },
  { _id: 2, orderId: "B456", status: "pending", expectedStatus: "shipped" },
  { _id: 3, orderId: "C789", status: "delivered", expectedStatus: "delivered" }
]);

Query example

db.orders.aggregate([
  {
    $project: {
      orderId: 1,
      status: 1,
      expectedStatus: 1,
      needsAttention: { $ne: ["$status", "$expectedStatus"] }
    }
  }
]);

Output

[
  { _id: 1, orderId: 'A123', status: 'shipped', expectedStatus: 'shipped', needsAttention: false },
  { _id: 2, orderId: 'B456', status: 'pending', expectedStatus: 'shipped', needsAttention: true },
  { _id: 3, orderId: 'C789', status: 'delivered', expectedStatus: 'delivered', needsAttention: false }
]

Code examples

To view a code example for using the $ne aggregation operator, choose the tab for the language that you want to use:

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('orders');

  const result = await collection.aggregate([
    {
      $project: {
        orderId: 1,
        status: 1,
        expectedStatus: 1,
        needsAttention: { $ne: ["$status", "$expectedStatus"] }
      }
    }
  ]).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['orders']

    result = list(collection.aggregate([
        {
            '$project': {
                'orderId': 1,
                'status': 1,
                'expectedStatus': 1,
                'needsAttention': { '$ne': ['$status', '$expectedStatus'] }
            }
        }
    ]))

    print(result)
    client.close()

example()