Cracking MongoDB Aggregation: Step-by-Step Problem Solving

Learn MongoDb Aggregation 2024

This video tutorial guides you through a MongoDB aggregation pipeline to retrieve posts containing the top 3 most frequently used tags.

We'll break down the steps involved:

Unwind the Tags Array:
We'll use the $unwind operator to separate each tag from the tags array within each post document.

Group by Tags and Count:
Using the $group operator, we'll group documents by tags and create a count for each unique tag.

Push Titles into an Array:
We'll create an array to store the titles of posts containing each tag using the $push accumulator.

Sort by Count (Descending):
The $sort operator arranges the results in descending order based on the count (most popular tags first).

Limit to Top 3:
We'll use the $limit operator to restrict the output to only the top 3 tags.

Project and Rename Fields :
Finally, the $project operator allows you to display the desired output format, including renaming the _id field to "tags" for better readability.
By following these steps, you'll be able to efficiently query your MongoDB database to find posts associated with the most popular tags.

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Видео Cracking MongoDB Aggregation: Step-by-Step Problem Solving канала Witty Coder