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Mongodb Tutorial

MongoDB skip() and limit()

Description

The limit() function in MongoDB is used to specify the maximum number of results to be returned. Only one parameter is required for this function.to return the number of the desired result.

Sometimes it is required to return a certain number of results after a certain number of documents. The skip() can do this job.

Our database name is 'myinfo' and our collection name is 'userdetails'. Here, is the collection bellow.

Sample collection "userdetails"

{
        "_id" : ObjectId("528cab88e1e41035b889f2bf"),
        "user_id" : "user1",
        "password" : "1a2b3c",
        "date_of_join" : "16/10/2010",
        "education" : "M.C.A.",
        "profession" : "CONSULTANT",
        "interest" : "MUSIC",
        "community_name" : [
                "MODERN MUSIC",
                "CLASSICAL MUSIC",
                "WESTERN MUSIC"
        ],
        "community_moder_id" : [
                "MR. Alex",
                "MR. Dang",
                "MR Haris"
        ],
        "community_members" : [
                700,
                200,
                1500
        ],
        "friends_id" : [
                "kumar",
                "harry",
                "anand"
        ],
        "ban_friends_id" : [
                "Amir",
                "Raja",
                "mont"
        ]
}
{
        "_id" : ObjectId("528cabb5e1e41035b889f2c0"),
        "user_id" : "user2",
        "password" : "11aa1a",
        "date_of_join" : "17/10/2009",
        "education" : "M.B.A.",
        "profession" : "MARKETING",
        "interest" : "MUSIC",
        "community_name" : [
                "MODERN MUSIC",
                "CLASSICAL MUSIC",
                "WESTERN MUSIC"
        ],
        "community_moder_id" : [
                "MR. Roy",
                "MR. Das",
                "MR Doglus"
        ],
        "community_members" : [
                500,
                300,
                1400
        ],
        "friends_id" : [
                "pal",
                "viki",
                "john"
        ],
        "ban_friends_id" : [
                "jalan",
                "monoj",
                "evan"
        ]
}
{
        "_id" : ObjectId("528cabd0e1e41035b889f2c1"),
        "user_id" : "user3",
        "password" : "b1c1d1",
        "date_of_join" : "16/10/2010",
        "education" : "M.C.A.",
        "profession" : "IT COR.",
        "interest" : "ART",
        "community_name" : [
                "MODERN ART",
                "CLASSICAL ART",
                "WESTERN ART"
        ],
        "community_moder_id" : [
                "MR. Rifel",
                "MR. Sarma",
                "MR Bhatia"
        ],
        "community_members" : [
                5000,
                2000,
                1500
        ],
        "friends_id" : [
                "philip",
                "anant",
                "alan"
        ],
        "ban_friends_id" : [
                "Amir",
                "Raja",
                "mont"
        ]
}
{
        "_id" : ObjectId("528cabece1e41035b889f2c2"),
        "user_id" : "user4",
        "password" : "abczyx",
        "date_of_join" : "17/8/2009",
        "education" : "M.B.B.S.",
        "profession" : "DOCTOR",
        "interest" : "SPORTS",
        "community_name" : [
                "ATHELATIC",
                "GAMES FAN GYES",
                "FAVOURIT GAMES"
        ],
        "community_moder_id" : [
                "MR. Paul",
                "MR. Das",
                "MR Doglus"
        ],
        "community_members" : [
                2500,
                2200,
                3500
        ],
        "friends_id" : [
                "vinod",
                "viki",
                "john"
        ],
        "ban_friends_id" : [
                "jalan",
                "monoj",
                "evan"
        ]
}

Document written in command prompt.

Fetch limited number of documents from the collection

If we want to fetch first two documents from the collection "userdetails", the following mongodb command can be used :

>db.userdetails.find().limit(2).pretty();

N.B. find() method displays the documents in a non structured format but to display the results in a formatted way, the pretty() method can be used.

The SQL equivalent code is

SELECT * 
FROM userdetails LIMIT 2; 

Output:

{
        "_id" : ObjectId("528cab88e1e41035b889f2bf"),
        "user_id" : "user1",
        "password" : "1a2b3c",
        "date_of_join" : "16/10/2010",
        "education" : "M.C.A.",
        "profession" : "CONSULTANT",
        "interest" : "MUSIC",
        "community_name" : [
                "MODERN MUSIC",
                "CLASSICAL MUSIC",
                "WESTERN MUSIC"
        ],
        "community_moder_id" : [
                "MR. Alex",
                "MR. Dang",
                "MR Haris"
        ],
        "community_members" : [
                700,
                200,
                1500
        ],
        "friends_id" : [
                "kumar",
                "harry",
                "anand"
        ],
        "ban_friends_id" : [
                "Amir",
                "Raja",
                "mont"
        ]
}
{
        "_id" : ObjectId("528cabb5e1e41035b889f2c0"),
        "user_id" : "user2",
        "password" : "11aa1a",
        "date_of_join" : "17/10/2009",
        "education" : "M.B.A.",
        "profession" : "MARKETING",
        "interest" : "MUSIC",
        "community_name" : [
                "MODERN MUSIC",
                "CLASSICAL MUSIC",
                "WESTERN MUSIC"
        ],
        "community_moder_id" : [
                "MR. Roy",
                "MR. Das",
                "MR Doglus"
        ],
        "community_members" : [
                500,
                300,
                1400
        ],
        "friends_id" : [
                "pal",
                "viki",
                "john"
        ],
        "ban_friends_id" : [
                "jalan",
                "monoj",
                "evan"
        ]
}

Document written in command prompt.

The above output shows that, only first two documents have fetched from the collection "userdetails".

Fetch number of documents with skip()

If we want to fetch two documents after the first two documents from the collection 'userdetails', the following mongodb command can be used :

>db.userdetails.find().skip(2).pretty();

N.B. find() method displays the documents in a non structured format but to display the results in a formatted way, the pretty() method can be used.

The SQL equivalent code is

SELECT * 
FROM userdetails SKIP 2; 

Output:

{
        "_id" : ObjectId("528cabd0e1e41035b889f2c1"),
        "user_id" : "user3",
        "password" : "b1c1d1",
        "date_of_join" : "16/10/2010",
        "education" : "M.C.A.",
        "profession" : "IT COR.",
        "interest" : "ART",
        "community_name" : [
                "MODERN ART",
                "CLASSICAL ART",
                "WESTERN ART"
        ],
        "community_moder_id" : [
                "MR. Rifel",
                "MR. Sarma",
                "MR Bhatia"
        ],
        "community_members" : [
                5000,
                2000,
                1500
        ],
        "friends_id" : [
                "philip",
                "anant",
                "alan"
        ],
        "ban_friends_id" : [
                "Amir",
                "Raja",
                "mont"
        ]
}
{
        "_id" : ObjectId("528cabece1e41035b889f2c2"),
        "user_id" : "user4",
        "password" : "abczyx",
        "date_of_join" : "17/8/2009",
        "education" : "M.B.B.S.",
        "profession" : "DOCTOR",
        "interest" : "SPORTS",
        "community_name" : [
                "ATHELATIC",
                "GAMES FAN GYES",
                "FAVOURIT GAMES"
        ],
        "community_moder_id" : [
                "MR. Paul",
                "MR. Das",
                "MR Doglus"
        ],
        "community_members" : [
                2500,
                2200,
                3500
        ],
        "friends_id" : [
                "vinod",
                "viki",
                "john"
        ],
        "ban_friends_id" : [
                "jalan",
                "monoj",
                "evan"
        ]
}

Document written in command prompt.

The above output shows that, two documents after the first two have fetched from the collection "userdetails".

Fetch number of documents with skip() and limit()

If we want to fetch the two documents after the first document from the collection 'userdetails', the following mongodb command can be used :

>db.userdetails.find().skip(1).limit(2).pretty();

N.B. find() method displays the documents in a non structured format but to display the results in a formatted way, the pretty() method can be used.

The SQL equivalent code is

SELECT * 
FROM userdetails LIMIT 2 SKIP 1;

Output:

{
        "_id" : ObjectId("527e12fe7d99d3b3d4f62759"),
        "user_id" : "user2",
        "password" : "11aa1a",
        "date_of_join" : "17/10/2009",
        "education" : "M.B.A.",
        "profession" : "MARKETING",
        "interest" : "MUSIC",
        "community_name" : [
                "MODERN MUSIC",
                "CLASSICAL MUSIC",
                "WESTERN MUSIC"
        ],
        "community_moder_id" : [
                "MR. Roy",
                "MR. Das",
                "MR Doglus"
        ],
        "community_members" : [
                500,
                300,
                1400
        ],
        "friends_id" : [
                "pal",
                "viki",
                "john"
        ],
        "ban_friends_id" : [
                "jalan",
                "monoj",
                "evan"
        ]
}
{
        "_id" : ObjectId("527e131b7d99d3b3d4f6275a"),
        "user_id" : "user3",
        "password" : "b1c1d1",
        "date_of_join" : "16/10/2010",
        "education" : "M.C.A.",
        "profession" : "IT COR.",
        "interest" : "ART",
        "community_name" : [
                "MODERN ART",
                "CLASSICAL ART",
                "WESTERN ART"
        ],
        "community_moder_id" : [
                "MR. Rifel",
                "MR. Sarma",
                "MR Bhatia"
        ],
        "community_members" : [
                5000,
                2000,
                1500
        ],
        "friends_id" : [
                "philip",
                "anant",
                "alan"
        ],
        "ban_friends_id" : [
                "Amir",
                "Raja",
                "mont"
        ]
}

Document written in command prompt.

The above output shows that, the only one document after the first two have fetched from the collection "userdetails."

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