/binaryMongo

1.
    
    db.people.find({ "scores" : { $all : [ { "$elemMatch" : { score: { $gte: 87, $lte: 93 } } } ] } });
2.
    
    db.people.aggregate([{ $unwind: "$scores" }, { $match: { "scores.type" : "exam", "scores.score": { $gt: 90 } } }]);

3.
    
    db.people.update({ "name" : "Dusti Lemmond" }, { $set : { "accepted": true }}, { multi: true } );