What
does the $count stage return?

Question

What
does the  $count  stage return?

Accepted Answer

A single document with one field that contains
the value set to the number of documents at this stage in the aggregation
pipeline.

Answer

A
set number of documents from the aggregation pipeline.

Answer

The
number of groups in an aggregation pipeline.

Answer

A
single document that contains the number of fields that have been modified in
an aggregation pipeline.

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