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Is it possible to get single result in aggregate?

Can you get a single result using MongoDB's aggregate function?

Yes, it is possible to get a single result using MongoDB's aggregate function. There are multiple ways to achieve this.

1. Using $limit stage

db.collection.aggregate([
  { $limit: 1 }
])

The $limit stage limits the number of documents returned by the aggregation pipeline, in this case, to a single document.

2. Using $group stage with _id: null

db.collection.aggregate([
  { $group: { _id: null, result: { $first: "$_id" } } }
])

The $group stage groups the documents by a specified _id field. In this case, we set _id to null, which effectively groups all the documents into a single group. The $first operator then returns the value of the first document in the group, which is the desired single result.

3. Using the aggregateOne() method

db.collection.aggregateOne([
  { $match: { _id: "some-id" } }
])

The aggregateOne() method is a helper method that simplifies getting a single result from an aggregation pipeline. It is equivalent to using the $limit or $group stages as shown above.

The choice of which method to use depends on your specific use case and performance requirements. The $limit stage is the most straightforward and efficient option, while the $group stage with _id: null provides more flexibility.

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