What are MongoDB aggregation operators?

What are MongoDB aggregation operators?

MongoDB aggregation operators are functions that process data records and return computed results. They are used in the aggregation framework to perform operations like filtering, grouping, and sorting.

Can you give me an example of how to use the $group operator?

Sure! The $group operator is used to group documents by a specified identifier. For example, if you have a collection of sales data, you can group by the 'productId' and calculate the total sales for each product.

What other aggregation operators should I know about?

Some important aggregation operators include $match, $sort, $project, and $lookup. Each serves a unique purpose in data processing.

How do I chain multiple aggregation operators together?

You can chain multiple aggregation operators by passing them as an array to the aggregate() method. For example: db.collection.aggregate([{$match: {...}}, {$group: {...}}, {$sort: {...}}]).