What are MongoDB aggregation operators?

Can you explain what MongoDB aggregation operators are?

Sure! MongoDB aggregation operators are special functions that process data records and return computed results. They are used in aggregation pipelines to transform and analyze data.

What are some common aggregation operators?

Some common aggregation operators include $match, $group, $sort, $project, and $limit. Each serves a different purpose in data processing.

How does the $group operator work?

The $group operator is used to group documents by a specified identifier and perform operations like counting, summing, or averaging on grouped data.

Can you give me an example of using $match in an aggregation pipeline?

Certainly! In an aggregation pipeline, you can use $match to filter documents. For example, { $match: { status: 'active' } } will only pass documents with an 'active' status to the next stage.