MongoDB Aggregation $match
Aggregation $match
This aggregation stage behaves like a find. It will filter documents that match the query provided.
Using $match early in the pipeline can improve performance since it limits the number of documents the next stages must process.
Example
In this example, we are using the "sample_airbnb" database loaded from our sample data in the Intro to Aggregations section.
db.listingsAndReviews.aggregate([
{ $match : { property_type : "House" } },
{ $limit: 2 },
{ $project: {
"name": 1,
"bedrooms": 1,
"price": 1
}}
])
This will only return documents that have the property_type of "House".
