You can use $in operator to find through the list of ids in MongoDB. To understand the concept, let us create a collection with the document. The query to create a collection with a document is as follows −> db.findListOfIdsDemo.insertOne({"StudentName":"Carol", "StudentAge":21}); {    "acknowledged" : true,    "insertedId" : ObjectId("5c8ecadd2f684a30fbdfd575") ... Read More

In order to replace substring in MongoDB document, you can use the replace() function. To understand it further, let us create a collection with document. The query to create a collection with document is as follows −> db.replaceSubstringDemo.insertOne({"WebsiteURL":"www.gogle.com"}); {    "acknowledged" : true,    "insertedId" : ObjectId("5c76eaf21e9c5dd6f1f78276") }Display all documents ... Read More

This example demonstrate about How to use substring () in Android textview.Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.Step 2 − Add the following code to res/layout/activity_main.xml.         ... Read More

You can use $nin operator for this. To understand the concept, let us create a collection with the document. The query to create a collection with a document is as follows −> db.documentWithAParticularFieldValueDemo.insertOne(    ... {       ...       ... "StudentId" : 101,       ... Read More

In this program a random graph is generated for random vertices and edges. The time complexity of this program is O(v*e). Where v is the number of vertices and e is the number of edges.AlgorithmBegin    Develop a function GenRandomGraphs(), with ‘e’ as the    number of edges and ‘v’ ... Read More

The is a header file. This file includes all standard library. Sometimes in some coding contests, when we have to save time while solving, then using this header file is helpful.In software engineering approach we should reduce the minimize the include. Using this header file, it will include lots ... Read More

This example demonstrate about How to use trim () in Android textview.Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.Step 2 − Add the following code to res/layout/activity_main.xml.     ... Read More

You can use $ne(Not Equal) operator for this. To understand the concept, let us create a collection with document. The query to create a collection with document is as follows −> db.arrayFieldIsNotEmptyDemo.insertOne({"StudentName":"Larry", "StudentTechnicalSubject":["Java", "C"]}); {    "acknowledged" : true,    "insertedId" : ObjectId("5c76fe2f1e9c5dd6f1f78291") } > db.arrayFieldIsNotEmptyDemo.insertOne({"StudentName":"Mike", "StudentTechnicalSubject":[]}); {    "acknowledged" ... Read More

To delete all records of a collection in MongoDB shell, use the remove() method. The syntax is as follows −db.yourCollectionName.remove({});To understand the syntax, let us create a collection with document. The query to create a collection with document is as follows −> db.deleteAllRecordsDemo.insertOne({"StudentName":"John"}); {    "acknowledged" : true,    "insertedId" ... Read More

To find the minimum value in MongoDB, you can use sort() along with limit(1). The syntax is as follows −db.yourCollectionName.find().sort({yourFieldName: 1}).limit(1);To understand the concept, let us create a collection with the document. The query to create a collection with a document is as follows −> db.findMinValueDemo.insertOne({"StudentMarks":78}); {    "acknowledged" : ... Read More