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.
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