MongoDB Tutorial 0/120 lessons ~6 min read Lesson 55“Document-first database engineering”

Advanced Aggregation Patterns

Real-world aggregations chain dozens of stages: bucketing, windowing, time-series resampling, conditional grouping, recursive graph traversal ($graphLookup).

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Focus

2 guided sections

Practice signal

Concept-first lesson

Career prep

Foundation builder

Introduction

Real-world aggregations chain dozens of stages: bucketing, windowing, time-series resampling, conditional grouping, recursive graph traversal ($graphLookup). These are the patterns senior data engineers reach for.

Understanding the topic

$bucket / $bucketAuto — histogram-style binning.
$setWindowFields — moving averages, running totals.
$graphLookup — recursive relationships (org charts, dependency trees).
$densify + $fill — time-series gap filling.

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