MongoDB Query Language Reference

You can use the MongoDB Query language to perform queries. MQL comprises query predicates, aggregation pipelines, and other ways to interact with your data.

CRUD Commands

Database commands used to perform CRUD operations, including aggregation.

Aggregation Stages

Aggregation stages used to construct aggregation pipelines.

Query Predicates

Expressions used to indicate whether a document matches a given query.

Expressions

Expressions used in various contexts of MQL including aggregations, query predicates, and projections.

Find Command Projection Operators

Specialized operators used in find command projections.

Accumulators

Operators used in group stages to return aggregated values from multiple input documents.

Update Operators

Operators used to modify documents.