Is it possible to get single result in aggregate?

Is it possible to get a single result in an aggregate?

Yes, it is possible to get a single result in an aggregate. There are a few ways to do this, depending on your specific needs.

Using the $limit operator

The simplest way to get a single result from an aggregate is to use the $limit operator. The $limit operator limits the number of documents that are returned by the aggregation. For example, the following aggregation will return only the first document in the collection:

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

Using the $match operator

Another way to get a single result from an aggregate is to use the $match operator. The $match operator filters the documents in the collection based on a specified condition. For example, the following aggregation will return only the first document in the collection that matches the condition { "name": "John Doe" }:

``` db.collection.aggregate([ { $match: { "name": "John Doe" } }, { $limit: 1 } ]) ``` Using the $group operator

You can also use the $group operator to get a single result from an aggregate. The $group operator groups the documents in the collection based on a specified field. For example, the following aggregation will return the total number of documents in the collection:

``` db.collection.aggregate([ { $group: { _id: null, count: { $sum: 1 } } } ]) ``` Conclusion

There are a few different ways to get a single result from an aggregate. The best way to do this will depend on your specific needs. If there isn't a clean way to do it with an aggregate then converting the results to a list and getting the first element should work in most cases.