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Overview

High-level operations

The following high-level operations are described here after:

  • FOR: Iterate over all elements of an array.
  • RETURN: Produce the result of a query.
  • FILTER: Restrict the results to elements that match arbitrary logical conditions.
  • SORT: Force a sort of the array of already produced intermediate results.
  • LIMIT: Reduce the number of elements in the result to at most the specified number, optionally skip elements (pagination).
  • LET: Assign an arbitrary value to a variable.
  • COLLECT: Group an array by one or multiple group criteria. Can also count and aggregate.
  • REMOVE: Remove documents from a collection.
  • UPDATE: Partially update documents in a collection.
  • REPLACE: Completely replace documents in a collection.
  • INSERT: Insert new documents into a collection.
  • UPSERT: Update/replace an existing document, or create it in the case it does not exist.
  • WITH: Specify collections used in a query (at query begin only).