MongoDB Exercise - The restaurants in Manhattan with grades of 2 and 6 are listed below

Write a MongoDB query to find the restaurants that have a grade with a score of 2 and a grade with a score of 6 and are located in the borough of Manhattan.

Structure of 'restaurants' collection :

{
  "address": {
     "building": "1007",
     "coord": [ -73.856077, 40.848447 ],
     "street": "Morris Park Ave",
     "zipcode": "10462"
  },
  "borough": "Bronx",
  "cuisine": "Bakery",
  "grades": [
     { "date": { "$date": 1393804800000 }, "grade": "A", "score": 2 },
     { "date": { "$date": 1378857600000 }, "grade": "A", "score": 6 },
     { "date": { "$date": 1358985600000 }, "grade": "A", "score": 10 },
     { "date": { "$date": 1322006400000 }, "grade": "A", "score": 9 },
     { "date": { "$date": 1299715200000 }, "grade": "B", "score": 14 }
  ],
  "name": "Morris Park Bake Shop",
  "restaurant_id": "30075445"
}

Query:

db.restaurants.find({
  $and: [
    {"grades.score": 2},
    {"grades.score": 6},
    {"borough": "Manhattan"}
  ]
})

Output:

{ "_id" : ObjectId("6422c7dd1238e3bec47ca655"), "address" : { "building" : "567", "coord" : [ -74.00619499999999, 40.735663 ], "street" : "Hudson Street", "zipcode" : "10014" }, "borough" : "Manhattan", "cuisine" : "American ", "grades" : [ { "date" : { "$date" : 1406505600000 }, "grade" : "A", "score" : 2 }, { "date" : { "$date" : 1374710400000 }, "grade" : "A", "score" : 7 }, { "date" : { "$date" : 1360022400000 }, "grade" : "A", "score" : 2 }, { "date" : { "$date" : 1338249600000 }, "grade" : "A", "score" : 6 }, { "date" : { "$date" : 1324598400000 }, "grade" : "A", "score" : 5 } ], "name" : "White Horse Tavern", "restaurant_id" : "40364958" }
{ "_id" : ObjectId("6422cadd1238e3bec47ca661"), "address" : { "building" : "842", "coord" : [ -73.97063700000001, 40.751495 ], "street" : "2 Avenue", "zipcode" : "10017" }, "borough" : "Manhattan", "cuisine" : "American ", "grades" : [ { "date" : { "$date" : 1405987200000 }, "grade" : "A", "score" : 6 }, { "date" : { "$date" : 1369699200000 }, "grade" : "A", "score" : 2 }, { "date" : { "$date" : 1338249600000 }, "grade" : "A", "score" : 8 }, { "date" : { "$date" : 1325721600000 }, "grade" : "A", "score" : 9 }, { "date" : { "$date" : 1312934400000 }, "grade" : "B", "score" : 24 } ], "name" : "Keats Restaurant", "restaurant_id" : "40365288" }
.....

Explanation:

The said query in MongoDB that returns the restaurants that have a grade with a score of 2 and a grade with a score of 6 and are located in the borough of Manhattan.

The uses of $and operator combines the first two conditions that check whether any of the grades array elements have a score field equal to 2 or 6, respectively and the third condition checks if the borough field is equal to "Manhattan".

Note: This output is generated using MongoDB server version 3.6

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