If you've used other db like OrientDB, you can use SQL to query documents. Even if MongoDB added this I wouldn't rely on it, as there have been many deployments

If you've used other db like OrientDB, you can use SQL to query documents. Even if MongoDB added this I wouldn't rely on it, as there have been many deployments that couldn't scale properly due to MongoDB and ended up switching to another vendor. It already has the reputation of being snake oil salesman of the DB world.