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    Perform Group Operations on Array Fields in MongoDB

    mongodbmongodb

    In our last lesson, we saw how we can use $group operator to simulate GROUP BY operations that you might be aware from SQL. A minor gimmick with $group is that it only works with the scalar field values and not arrays. There might be times when you would want to group by some array fields; in this lesson, we learn how to do that using $unwind operator

    Here is the list of operators that we cover in this lesson:

    You can see the list of all the available operators in the MongoDB docs.