How can I use the aggregation framework in MongoDB?

How can I use the aggregation framework in MongoDB?

The aggregation framework in MongoDB is used to process data and return computed results. You can use it to perform operations like filtering, grouping, and sorting.

Can you give me an example of an aggregation query?

Sure! Here's a simple example: db.collection.aggregate([ { $match: { status: 'A' } }, { $group: { _id: '$cust_id', total: { $sum: '$amount' } } } ]).

What does the $group stage do in that query?

The $group stage groups documents by a specified identifier, in this case, 'cust_id', and allows you to perform operations like summing up the 'amount' for each group.

Are there other stages I can use in aggregation?

Yes, there are several stages like $match, $sort, $project, and $limit, each serving different purposes in data processing.