1. db.restaurants.find();
2. db.restaurants.find().sort({name: 1}).limit(10);
3. var objectId = db.restaurants.findOne({}, {_id: 1})._id
   db.restaurants.findOne(objectId);
4. db.restaurants.find({borough: "Queens"});
5. db.restaurants.count();
6. db.restaurants.find({"address.zipcode": "11206"}).count();
7. var objectId = db.restaurants.findOne({}, {_id: 1})._id;
   db.restaurants.find({_id: objectId}).count();
   1
   db.restaurants.remove({_id: objectId});
   WriteResult({ "nRemoved" : 1 })
   db.restaurants.find({_id: objectId}).count();
   0
8. var objectId = db.restaurants.findOne({}, {_id: 1})._id;
   db.restaurants.updateOne(
   {_id: objectId},
   {$set: {name: "Bizz Bar Bang"}}
   );
9. db.restaurants.update(
   {"address.zipcode": "10035"},
   {$set: {"address.zipcode": "10036"}},
   {multi: true}
   );