db.restaurant.find()
db.restaurants.find().
  sort( {name: 1} ).
  limit(10)
db.restaurants.findOne()
db.restaurants.find({"_id": ObjectId("")})
db.restaurants.find({borough: "Queens"}, {_id: 1, name: 1, address: 1 })
db.restaurants.count()
db.restaurants.find({"address.zipcode": "11206"}).pretty()
db.restaurants.deleteOne({_id: ObjectId("")})