MongoDB Tutorial 0/120 lessons ~6 min read Lesson 54“Document-first database engineering”

Facet Stage

$facet runs multiple sub-pipelines on the same input in one query.

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Focus

2 guided sections

Practice signal

Concept-first lesson

Career prep

Foundation builder

Introduction

$facet runs multiple sub-pipelines on the same input in one query. Perfect for dashboards that need several slices of the same data.

Syntax reference

{ $facet: {
  byStatus:  [ { $group: { _id: "$status",  c: { $sum: 1 } } } ],
  byMonth:   [ { $group: { _id: { $month: "$createdAt" }, c: { $sum: 1 } } } ]
}}

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