How to make group in mongodb?

@ryleigh 

To create a group in MongoDB, you can use the aggregation framework to group documents in a collection based on certain criteria. Here is an example of how you can make a group in MongoDB:

1. Connect to your MongoDB database using a client like the MongoDB shell or a programming language driver.
2. Use the aggregate method to perform aggregation operations on your collection. The aggregate method takes an array of stages that define the operations to be performed.
3. Use the $group stage to group documents in the collection based on the specified key or keys. You can use various accumulation operators like $sum, $avg, $min, $max, etc. to perform calculations on the grouped data.

Here is an example query to group documents by a field called "category" in a collection called "products" and calculate the total count of products in each category:

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db.products.aggregate([
  {
    $group: {
      _id: "$category",
      totalProducts: { $sum: 1 }
    }
  }
])

In this example, $group is used to group documents by the "category" field and calculate the total count of products in each category.

You can customize the group query based on your specific requirements and add other stages like $match, $sort, etc. to further refine the aggregation pipeline.

Make sure to refer to the MongoDB documentation for more information on aggregation operations and available operators.