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How to Use $addToSet in $group Stage | MongoDB Aggregation Hindi Tutorial
131 : Using $addToSet with $group in MongoDB Aggregation | MongoDB Tutorial in Hindi
MongoDB Tutorial for beginner to advance

In this tutorial, you will learn how to use the $addToSet operator with the $group stage in MongoDB’s aggregation pipeline. The $addToSet accumulator allows you to collect unique values from multiple documents into an array within each group, which is very useful for removing duplicates while aggregating data.

🧠 What You’ll Learn:
Introduction to $addToSet in $group stage
How to collect unique values in grouped documents
Practical examples using MongoDB aggregation
Step-by-step implementation in MongoDB
Tips for using $addToSet efficiently

📂 Related Topics:
$group aggregation stage
Accumulator operators: $push, $first, $last, $avg, $min, $max
Aggregation pipeline basics
$match and $project stages

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