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Query and Projection Operators

Query Selectors

Comparison

For comparison of different BSON type values, see the specified BSON comparison order.

Name Description
$eq Matches values that are equal to a specified value.
$gt Matches values that are greater than a specified value.
$gte Matches values that are greater than or equal to a specified value.
$lt Matches values that are less than a specified value.
$lte Matches values that are less than or equal to a specified value.
$ne Matches all values that are not equal to a specified value.
$in Matches any of the values specified in an array.
$nin Matches none of the values specified in an array.

Logical

Name Description
$or Joins query clauses with a logical OR returns all documents that match the conditions of either clause.
$and Joins query clauses with a logical AND returns all documents that match the conditions of both clauses.
$not Inverts the effect of a query expression and returns documents that do not match the query expression.
$nor Joins query clauses with a logical NOR returns all documents that fail to match both clauses.

Element

Name Description
$exists Matches documents that have the specified field.
$type Selects documents if a field is of the specified type.

Evaluation

Name Description
$mod Performs a modulo operation on the value of a field and selects documents with a specified result.
$regex Selects documents where values match a specified regular expression.
$text Performs text search.
$where Matches documents that satisfy a JavaScript expression.

Geospatial

Name Description
$geoWithin Selects geometries within a bounding GeoJSON geometry. The 2dsphere and 2d indexes support $geoWithin.
$geoIntersects Selects geometries that intersect with a GeoJSON geometry. The 2dsphere index supports $geoIntersects.
$near Returns geospatial objects in proximity to a point. Requires a geospatial index. The 2dsphere and 2d indexes support $near.
$nearSphere Returns geospatial objects in proximity to a point on a sphere. Requires a geospatial index. The 2dsphere and 2d indexes support $nearSphere.

Array

Name Description
$all Matches arrays that contain all elements specified in the query.
$elemMatch Selects documents if element in the array field matches all the specified $elemMatch conditions.
$size Selects documents if the array field is a specified size.

Comments

Name Description
$comment Adds a comment to a query predicate.

Projection Operators

Name Description
$ Projects the first element in an array that matches the query condition.
$elemMatch Projects the first element in an array that matches the specified $elemMatch condition.
$meta Projects the document’s score assigned during $text operation.
$slice Limits the number of elements projected from an array. Supports skip and limit slices.

Additional Resources