MongoDB-aggregate-FrameWork

The followings things are discussed

1.Aggregation Stages

    a. $group
    b. $match
    c. $sort
    d. $project
    e. $out

2. Stages Chaining

3. Accumulator Operator { $sum ,$avg }

4. Unary Operators {$type}

Sample documents in the collection person is {1000 entries are there.}

  /* 1 */
  {
      "_id" : ObjectId("5dd3cb21b6686ce0703dd745"),
      "index" : 0,
      "name" : "Aurelia Gonzales",
      "isActive" : false,
      "registered" : ISODate("2015-02-11T04:22:39.000Z"),
      "age" : 20,
      "gender" : "female",
      "eyeColor" : "green",
      "favoriteFruit" : "banana",
      "company" : {
          "title" : "YURTURE",
          "email" : "[email protected]",
          "phone" : "+1 (940) 501-3963",
          "location" : {
              "country" : "USA",
              "address" : "694 Hewes Street"
          }
      },
      "tags" : [ 
          "enim", 
          "id", 
          "velit", 
          "ad", 
          "consequat"
      ]
  }