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Found 1349 Articles for MongoDB
![AmitDiwan](https://www.tutorialspoint.com/assets/profiles/123055/profile/60_187394-1565938756.jpg)
373 Views
For this, simply use MongoDB $group. Let us first create a collection with documents −> db.demo16.insertOne({ ... "StudentName" : "Chris", ... "StudentSection" : "A", ... "StudentAge" : 23, ... "StudentMarks" : 47 ... } ... ); { "acknowledged" : true, "insertedId" : ObjectId("5e13827455d0fc6657d21f07") } > db.demo16.insertOne({ ... "StudentName" : "Bob", ... "StudentSection" : "B", ... "StudentAge" : 21, ... "StudentMarks" : 85 ... } ... ); { "acknowledged" : true, "insertedId" : ObjectId("5e13827555d0fc6657d21f08") } > db.demo16.insertOne( { ... "StudentName" : "Carol", ... "StudentSection" : "A", ... ... Read More
![AmitDiwan](https://www.tutorialspoint.com/assets/profiles/123055/profile/60_187394-1565938756.jpg)
100 Views
For this, use the concept of createCollection() and getCollection(). Following is the query to create a collection with name ‘version’ −> db.createCollection('version'); { "ok" : 1 }Let us first create a collection with documents −> db.getCollection('version').insertOne({"VersionName":"1.0"}); { "acknowledged" : true, "insertedId" : ObjectId("5e100b47d7df943a7cec4fae") } > db.getCollection('version').insertOne({"VersionName":"1.1"}); { "acknowledged" : true, "insertedId" : ObjectId("5e100b49d7df943a7cec4faf") } > db.getCollection('version').insertOne({"VersionName":"1.2"}); { "acknowledged" : true, "insertedId" : ObjectId("5e100b4cd7df943a7cec4fb0") }Following is the query to display all documents from a collection with the help of find() method −> db.getCollection('version').find();This will produce the following output −{ "_id" : ObjectId("5e100b47d7df943a7cec4fae"), "VersionName" : "1.0" ... Read More
![AmitDiwan](https://www.tutorialspoint.com/assets/profiles/123055/profile/60_187394-1565938756.jpg)
100 Views
To match documents in MongoDB, use $elemMatch. Let us first create a collection with documents −> db.demo15.insertOne({"Details":[{"Score":56}, {"Score":78}]}); { "acknowledged" : true, "insertedId" : ObjectId("5e0f7806d7df943a7cec4fab") } > db.demo15.insertOne({"Details":[{"Score":86}, {"Score":86}]}); { "acknowledged" : true, "insertedId" : ObjectId("5e0f7817d7df943a7cec4fac") } > db.demo15.insertOne({"Details":[{"Score":97}, {"Score":85}]}); { "acknowledged" : true, "insertedId" : ObjectId("5e0f7823d7df943a7cec4fad") }Following is the query to display all documents from a collection with the help of find() method −> db.demo15.find();This will produce the following output −{ "_id" : ObjectId("5e0f7806d7df943a7cec4fab"), "Details" : [ { "Score" : 56 }, { "Score" : 78 } ] } { "_id" : ObjectId("5e0f7817d7df943a7cec4fac"), ... Read More
![AmitDiwan](https://www.tutorialspoint.com/assets/profiles/123055/profile/60_187394-1565938756.jpg)
118 Views
To concatenate, use $concatArrays in MongoDB. Let us first create a collection with documents −>db.demo14.insertOne({"ListOfStudent":["Carol", "Mike", "Sam"], "ListOfTeacher":["Robert", "David"]}); { "acknowledged" : true, "insertedId" : ObjectId("5e0f754bd7df943a7cec4faa") }Following is the query to display all documents from a collection with the help of find() method −> db.demo14.find().pretty();This will produce the following output −{ "_id" : ObjectId("5e0f754bd7df943a7cec4faa"), "ListOfStudent" : [ "Carol", "Mike", "Sam" ], "ListOfTeacher" : [ "Robert", "David" ] }Following is the query to concatenate array −> db.demo14.aggregate([ ... { ... Read More
![AmitDiwan](https://www.tutorialspoint.com/assets/profiles/123055/profile/60_187394-1565938756.jpg)
542 Views
The collMod makes it possible to add options to a collection or to modify view definitions. You can use runCommand() along with collMod(). Let us first create a collection with documents −> db.demo13.insertOne({"StudentFirstName":"Chris"}); { "acknowledged" : true, "insertedId" : ObjectId("5e0f730ad7df943a7cec4fa6") } > db.demo13.insertOne({"StudentFirstName":"David"}); { "acknowledged" : true, "insertedId" : ObjectId("5e0f7310d7df943a7cec4fa7") } > db.demo13.insertOne({"StudentFirstName":"Bob"}); { "acknowledged" : true, "insertedId" : ObjectId("5e0f7313d7df943a7cec4fa8") }Following is the query to display all documents from a collection with the help of find() method −> db.demo13.find();This will produce the following output −{ "_id" : ObjectId("5e0f730ad7df943a7cec4fa6"), "StudentFirstName" : "Chris" } { "_id" ... Read More
![AmitDiwan](https://www.tutorialspoint.com/assets/profiles/123055/profile/60_187394-1565938756.jpg)
162 Views
For nested search, use $and along with $or. Let us first create a collection with documents −> db.demo12.insertOne({"Name":"Chris", "Age":23, "CountryName":"US", "Message":"Hello"}); { "acknowledged" : true, "insertedId" : ObjectId("5e0f70a2d7df943a7cec4fa2") } > db.demo12.insertOne({"Name":"David", "Age":21, "CountryName":"US", "Message":"Hello"}); { "acknowledged" : true, "insertedId" : ObjectId("5e0f70acd7df943a7cec4fa3") } > db.demo12.insertOne({"Name":"Bob", "Age":23, "CountryName":"AUS", "Message":"Hi"}); { "acknowledged" : true, "insertedId" : ObjectId("5e0f70bad7df943a7cec4fa4") } > db.demo12.insertOne({"Name":"Carol", "Age":24, "CountryName":"US", "Message":"Hi"}); { "acknowledged" : true, "insertedId" : ObjectId("5e0f70c7d7df943a7cec4fa5") }Following is the query to display all documents from a collection with the help of find() method −> db.demo12.find();This will produce the following output −{ ... Read More
![AmitDiwan](https://www.tutorialspoint.com/assets/profiles/123055/profile/60_187394-1565938756.jpg)
565 Views
Let us first create a collection with documents −>db.demo11.insertOne({"ListOfStudent":[{"StudentName":"Chris", "ListOfScore":[76, 67, 54, 89]}]}); { "acknowledged" : true, "insertedId" : ObjectId("5e0f6e34d7df943a7cec4fa1") }Following is the query to display all documents from a collection with the help of find() method −> db.demo11.find().pretty();This will produce the following output −{ "_id" : ObjectId("5e0f6e34d7df943a7cec4fa1"), "ListOfStudent" : [ { "StudentName" : "Chris", "ListOfScore" : [ 76, 67, 54, ... Read More
![AmitDiwan](https://www.tutorialspoint.com/assets/profiles/123055/profile/60_187394-1565938756.jpg)
637 Views
For a single field, use find(). Let us first create a collection with documents −> db.demo10.insertOne({"StudentId":101, "StudentName":"Chris"}); { "acknowledged" : true, "insertedId" : ObjectId("5e0f68a7d7df943a7cec4f9b") } > db.demo10.insertOne({"StudentId":102, "StudentName":"David"}); { "acknowledged" : true, "insertedId" : ObjectId("5e0f68afd7df943a7cec4f9c") } > db.demo10.insertOne({"StudentId":103, "StudentName":"Bob"}); { "acknowledged" : true, "insertedId" : ObjectId("5e0f68b5d7df943a7cec4f9d") }Following is the query to display all documents from a collection with the help of find() method −> db.demo10.find();This will produce the following output −{ "_id" : ObjectId("5e0f68a7d7df943a7cec4f9b"), "StudentId" : 101, "StudentName" : "Chris" } { "_id" : ObjectId("5e0f68afd7df943a7cec4f9c"), "StudentId" : 102, "StudentName" : "David" } { "_id" ... Read More
![AmitDiwan](https://www.tutorialspoint.com/assets/profiles/123055/profile/60_187394-1565938756.jpg)
504 Views
For this, use update command and $push. Let us first create a collection with documents −>db.demo9.insertOne({"StudentDetails":[{"StudentName":"Chris", "ListOfSubject":["MySQL", "Java"]}]}); { "acknowledged" : true, "insertedId" : ObjectId("5e0f6438d7df943a7cec4f94") }Following is the query to display all documents from a collection with the help of find() method −> db.demo9.find().pretty();This will produce the following output −{ "_id" : ObjectId("5e0f6438d7df943a7cec4f94"), "StudentDetails" : [ { "StudentName" : "Chris", "ListOfSubject" : [ "MySQL", "Java" ] ... Read More
![AmitDiwan](https://www.tutorialspoint.com/assets/profiles/123055/profile/60_187394-1565938756.jpg)
244 Views
To compare two fields, use $where in MongoDB. Let us first create a collection with documents −> db.demo7.insertOne({"FirstName1":"JOHN", "FirstName2":"John"}); { "acknowledged" : true, "insertedId" : ObjectId("5e0ccd1a25ddae1f53b6222f") } > db.demo7.insertOne({"FirstName1":"Carol", "FirstName2":"Mike"}); { "acknowledged" : true, "insertedId" : ObjectId("5e0ccd2725ddae1f53b62230") } > db.demo7.insertOne({"FirstName1":"bob", "FirstName2":"BOB"}); { "acknowledged" : true, "insertedId" : ObjectId("5e0ccd3225ddae1f53b62231") }Following is the query to display all documents from a collection with the help of find() method −> db.demo7.find();This will produce the following output −{ "_id" : ObjectId("5e0ccd1a25ddae1f53b6222f"), "FirstName1" : "JOHN", "FirstName2" : "John" } { "_id" : ObjectId("5e0ccd2725ddae1f53b62230"), "FirstName1" : "Carol", "FirstName2" : "Mike" } ... Read More