Bitcoin is the latest buzz in the world of digital currency at the moment and those who see its significance from a permissive outlook, they go for it because they know it that through this magical currency they can make money faster and become rich. Well, I am sorry to burst that bubble, but to be honest; Bitcoin is like any other currency out there. Like there is no easy way to make money, similarly, there is no other or magical way to gain cryptocurrency or Bitcoins too.However, cryptocurrency may open up a new method of earning, but the basic ... Read More

The difference between a Block chain and a traditional database begins with architecture, creation, access, and permissions. They differ in each and every aspect except that they both are huge repositories of data which is stored and accessed in an organised form, digitally.DatabaseThis runs on a client-server network, where there is a central repository of data that will be accessed by those nodes who have permission to access the data. The data of the database is maintained by administrators, and mostly nodes will have access to retrieve the data as per their requirement.Database, which is an electronic collection of data ... Read More

You can use $lte operator along with Date() for this. Let us first create a collection with documents. Here, we have set the date 2019-05-11, which is the current date −> db.getDocumentsExpiredDemo.insertOne({"ArrivalDate":new ISODate("2019-05-11")}); {    "acknowledged" : true,    "insertedId" : ObjectId("5cd563b17924bb85b3f4893b") } > db.getDocumentsExpiredDemo.insertOne({"ArrivalDate":new ISODate("2019-01-01")}); {    "acknowledged" : true,    "insertedId" : ObjectId("5cd563bf7924bb85b3f4893c") } > db.getDocumentsExpiredDemo.insertOne({"ArrivalDate":new ISODate("2019-05-10")}); {    "acknowledged" : true,    "insertedId" : ObjectId("5cd563ca7924bb85b3f4893d") } > db.getDocumentsExpiredDemo.insertOne({"ArrivalDate":new ISODate("2019-02-01")}); {    "acknowledged" : true,    "insertedId" : ObjectId("5cd563e77924bb85b3f4893e") }Following is the query to display all documents from a collection with the help of find() method −> db.getDocumentsExpiredDemo.find().pretty();This ... Read More

To update array in MongoDB document by variable index, use the below syntax. Here, yourIndexValue in the index value, where yourIndexVariableName is the variable name for index −var yourIndexVariableName= yourIndexValue, anyVariableName= { "$set": {} }; yourVariableName["$set"]["yourFieldName."+yourIndexVariableName] = "yourValue"; db.yourCollectionName.update({ "_id":  yourObjectId}, yourVariableName);Let us first create a collection with documents −> db.updateByVariableDemo.insertOne({"StudentSubjects":["MySQL", "Java", "SQL Server", "PL/SQL"]}); {    "acknowledged" : true,    "insertedId" : ObjectId("5cd553c37924bb85b3f4893a") }Following is the query to display all documents from a collection with the help of find() method −> db.updateByVariableDemo.find().pretty();This will produce the following output −{    "_id" : ObjectId("5cd553c37924bb85b3f4893a"),    "StudentSubjects" : [       ... Read More

You can use map() for this. Let us first create a collection with documents −> db.deleteDemo.insertOne({"Name":"John"}); {    "acknowledged" : true,    "insertedId" : ObjectId("5cd550492cba06f46efe9f06") } > db.deleteDemo.insertOne({"Name":"Carol"}); {    "acknowledged" : true,    "insertedId" : ObjectId("5cd5504d2cba06f46efe9f07") } > db.deleteDemo.insertOne({"Name":"Sam"}); {    "acknowledged" : true,    "insertedId" : ObjectId("5cd550512cba06f46efe9f08") } > db.deleteDemo.insertOne({"Name":"David"}); {    "acknowledged" : true,    "insertedId" : ObjectId("5cd5505d2cba06f46efe9f09") } > db.deleteDemo.insertOne({"Name":"Robert"}); {    "acknowledged" : true,    "insertedId" : ObjectId("5cd550682cba06f46efe9f0a") } > db.deleteDemo.insertOne({"Name":"Chris"}); {    "acknowledged" : true,    "insertedId" : ObjectId("5cd5506f2cba06f46efe9f0b") } > db.deleteDemo.insertOne({"Name":"Mike"}); {    "acknowledged" : true,    "insertedId" : ObjectId("5cd550752cba06f46efe9f0c") } > db.deleteDemo.insertOne({"Name":"Bob"}); ... Read More

You can use $and operator. Let us first create a collection with documents −>db.selectingASingleFieldDemo.insertOne({"StudentFirstName":"John", "StudentAge":23, "StudentCountryName":"US"}); {    "acknowledged" : true,    "insertedId" : ObjectId("5cd547142cba06f46efe9f02") } >db.selectingASingleFieldDemo.insertOne({"StudentFirstName":"Carol", "StudentAge":21, "StudentCountryName":"UK"}); {    "acknowledged" : true,    "insertedId" : ObjectId("5cd5471f2cba06f46efe9f03") } >db.selectingASingleFieldDemo.insertOne({"StudentFirstName":"David", "StudentAge":24, "StudentCountryName":"AUS"}); {    "acknowledged" : true,    "insertedId" : ObjectId("5cd5472c2cba06f46efe9f04") } >db.selectingASingleFieldDemo.insertOne({"StudentFirstName":"Robert", "StudentAge":26, "StudentCountryName":"AUS"}); {    "acknowledged" : true,    "insertedId" : ObjectId("5cd548382cba06f46efe9f05") }Following is the query to display all documents from a collection with the help of find() method −> db.selectingASingleFieldDemo.find().pretty();This will produce the following output −{    "_id" : ObjectId("5cd547142cba06f46efe9f02"),    "StudentFirstName" : "John",    "StudentAge" : ... Read More

You can use aggregate framework for this. Let us first create a collection with documents −>db.aggregationOperatorDemo.insertOne({"FirstValue":392883,"SecondValue":10000000000}); {    "acknowledged" : true,    "insertedId" : ObjectId("5cd541452cba06f46efe9f01") }Following is the query to display all documents from a collection with the help of find() method −> db.aggregationOperatorDemo.find().pretty();This will produce the following output −{    "_id" : ObjectId("5cd541452cba06f46efe9f01"),    "FirstValue" : 392883,    "SecondValue" : 10000000000 }Following is the query to use divide aggregation operator −> db.aggregationOperatorDemo.aggregate([ ...   { "$project": { "Value": { "$divide": ["$FirstValue", "$SecondValue"] } } } ... ]);This will produce the following output −{ "_id" : ObjectId("5cd541452cba06f46efe9f01"), "Value" : 0.0000392883 }

Let us first create a collection with documents −> db.searchAnArrayDemo.insertOne({_id:1, "TechnicalDetails":[{"Language":"MongoDB"}]}); { "acknowledged" : true, "insertedId" : 1 } > db.searchAnArrayDemo.insertOne({_id:2, "TechnicalDetails":[{"Language":"MySQL"}]}); { "acknowledged" : true, "insertedId" : 2 } > db.searchAnArrayDemo.insertOne({_id:3, "TechnicalDetails":[{"Language":"MongoDB"}]}); { "acknowledged" : true, "insertedId" : 3 } > db.searchAnArrayDemo.insertOne({_id:4, "TechnicalDetails":[{"Language":"MongoDB"}]}); { "acknowledged" : true, "insertedId" : 4 } > db.searchAnArrayDemo.insertOne({_id:5, "TechnicalDetails":[{"Language":"Java"}]}); { "acknowledged" : true, "insertedId" : 5 }Following is the query to display all documents from a collection with the help of find() method −> db.searchAnArrayDemo.find().pretty();This will produce the following output −{ "_id" : 1, "TechnicalDetails" : [ { "Language" : "MongoDB" } ] } ... Read More

To update the inner field, use the below syntax −db.yourCollectionName.update({"_id" : yourObjectId}, {$set : {"yourOuterFieldName.yourInnerFieldName" :yourValue}});Let us first create a collection with documents −> db.updateDocumentDemo.insertOne( ...   { ... ...      "StudentDetails" : { ...         "StudentFirstName" : "Adam", ...         "StudentLastName" : "Samith" ...      }, ...      "StudentOtherDetails" : { ...         "StudentFavouriteSubject" : "MySQL", ...         "StudentScore" : 45 ...      } ...   } ... ); {    "acknowledged" : true,    "insertedId" : ObjectId("5cd50bb32cba06f46efe9efe") }Following is the query to ... Read More

You can use $set operator along with update(). Let us first create a collection with documents −> db.workingOfUpdateMethod.insertOne({"ClientCountryName" : "AUS"}); {    "acknowledged" : true,    "insertedId" : ObjectId("5cd506fe2cba06f46efe9efa") } > db.workingOfUpdateMethod.insertOne({"ClientCountryName" : "AUS"}); {    "acknowledged" : true,    "insertedId" : ObjectId("5cd507022cba06f46efe9efb") } > db.workingOfUpdateMethod.insertOne({"ClientCountryName" : "AUS"}); {    "acknowledged" : true,    "insertedId" : ObjectId("5cd507022cba06f46efe9efc") } > db.workingOfUpdateMethod.insertOne({"ClientCountryName" : "AUS"}); {    "acknowledged" : true,    "insertedId" : ObjectId("5cd507032cba06f46efe9efd") }Following is the query to display all documents from a collection with the help of find() method −> db.workingOfUpdateMethod.find().pretty();This will produce the following output −{ "_id" : ObjectId("5cd506fe2cba06f46efe9efa"), "ClientCountryName" ... Read More