If you are a beginner to MongoDB, writing queries using pipelines could be a little tricky. I personally took some time to understand how each part in the pipeline works and how to write them effectively. In this article, I present a few examples of writing queries with pipeline by explaining each query in detail. Let's take a collection of documents where each document tracks articles written by different authors on different categories. Each document tracks the task ID assigned to the author for tracking his/her progress and the articles written by him/her with the status of each article whether completed or pending. We have various authors writing different articles on categories like devops, testing, etc. Here, we store the document in the collection based on category and article status. The example structure is as below.


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