Login

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 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".

 
$match
Login
ADS CODE