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
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.