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We are given with an array of n integers and the task is to calculate the count all the triplets whose sum is equal to perfect cubeWhat is the perfect cubeA perfect cube is a number which is a cube of any number, like 125 is a cube of 5 so we can say that 125 is a perfect cube. Some of the perfect cube integers are 1, 8, 27, 64, 125….So, according to the problem in the array we have to find and count those triplets (set of 3 values) whose sum is equal to a perfect cube number. ... Read More
We are given a string with, let’s say, str and the task is to compute the count of characters in a string str having the same neighbors and that will include both left and right side of a character in a string. Also, in this scenario the first and last character in a string will always be considered as they have only one adjacent character.For ExampleInput − string str = “poiot” Output − count is 3Explanation − In the given string characters p, t and i are having the same neighbors so the count will be increased to 3.Input − ... Read More
Use $replaceRoot in MongoDB aggregation. The $replaceRoot replaces the input document with the specified document. The operation replaces all existing fields in the input document, including the _id field. Let us create a collection with documents −> db.demo733.insertOne( ... { ... "SubjectDetails": ... [ ... { ... SubjectName:"MongoDB", ... "Marks":85 ... }, ... { ... SubjectName:"MySQL", ... ... Read More
We are given a range having start and end and the task is to calculate the count of hexadecimal numbers or alphabets present in the given range.What are Hexadecimal Alphabets?In computer terms, hexadecimal numbers are those numbers that are having base 16 which means the binary digit can be represented in 16-bit. It consists of integer numbers starting from 0-15. Where 10 is represented as A, 11 as B, 12 as C, 13 as D, 14 as E and 15 as F.So, in the below program our task is to find whether the range consists of hexadecimal alphabets or not.For ... Read More
You can use $set. Let us create a collection with documents −> db.demo732.insertOne({_id:1, Language:"English"}); { "acknowledged" : true, "insertedId" : 1 } > db.demo732.insertOne({_id:2, Language:"Hindi"}); { "acknowledged" : true, "insertedId" : 2 }Display all documents from a collection with the help of find() method −> db.demo732.find();This will produce the following output −{ "_id" : 1, "Language" : "English" } { "_id" : 2, "Language" : "Hindi" }Following is the query to add a field with specific datatype (list, object) in an existing MongoDB document −> db.demo732.update({_id:1}, ... { $set:{details:{'subjectName':"MongoDB"}, studentDetails:[{Name:"David"}, {CountryName:"US"}]}}) WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : ... Read More
We are given a string of any length containing both uppercase and lowercase letters and the task is to compute the count of those characters whose ASCII values are prime.The ASCII values of uppercase letters[A-Z] start with 65 till 90 and lowercase letters[a-z] starts with 97 till 122.For ExampleInput string str = ‘Aebg’ Output count is: 2Explanation − The ASCII value for A is 65 which is a non-prime number so it willn’t be counted, e is 101 which is a prime number so it will be counted, b is 66 which is a nonprime number so it willn’t be ... Read More
To display a specific field, use $project along with $unwind. To ignore a field, set to 0. Let us create a collection with documents −> db.demo731.insertOne({ "ProductInformation": [ { ProductId:"Product-1", ProductPrice:80 }, { ProductId:"Product-2", ProductPrice:45 }, { ProductId:"Product-3", ProductPrice:50 } ] } ); { "acknowledged" : true, "insertedId" : ObjectId("5eac5efd56e85a39df5f6341") }Display all documents from a collection with the help of find() method −> db.demo731.find();This will produce the following output −{ "_id" : ObjectId("5eac5efd56e85a39df5f6341"), "ProductInformation" : [ { "ProductId" : "Product-1", "ProductPrice" : 80 }, { "ProductId" : "Product-2", "ProductPrice" : 45 }, { "ProductId" : "Product-3", "ProductPrice" : ... Read More
To match, use $match in MongoDB. For values greater than a specific number, use $gt. Let us create a collection with documents −> db.demo730.insertOne({"Name" : "Chris", "Marks" : 33 }); { "acknowledged" : true, "insertedId" : ObjectId("5eac54cd56e85a39df5f6339") } > db.demo730.insertOne({ "Name" : "David", "Marks" : 89}); { "acknowledged" : true, "insertedId" : ObjectId("5eac54cd56e85a39df5f633a") } > db.demo730.insertOne({ "Name" : "Chris", "Marks" : 45 }); { "acknowledged" : true, "insertedId" : ObjectId("5eac54ce56e85a39df5f633b") }Display all documents from a collection with the help of find() method −> db.demo730.find();This will produce the following output −{ "_id" : ObjectId("5eac54cd56e85a39df5f6339"), "Name" ... Read More
We are given a string of any length containing both uppercase and lowercase letters and the task is to compute the count of those characters that are at the same position as in english alphabets.For ExampleInput − String str = eBGD Output − Count is: 2Explanation − B and D are the characters that lie in the same order in english alphabets as B comes at second position and D comes at fourth position.Input − String str = Abcdeizxy Output − Count is: 5Explanation − A, B, C, D and E are the characters that lie in the same order ... Read More
For mass insertion, use the concept of insertMany() in MongoDB. The insertMany() inserts multiple documents into a collection.Let us create a collection with documents −> db.demo729.insertMany( [ ... { BankName:"HDFC Bank", cardType:"Credit", "CustomerName":[{Name:"Chris", Age:25}]}, ... { BankName:"ICICI Bank", cardType:"Debit", "CustomerName":[{Name:"Bob", Age:22}]}, ... { BankName:"Kotak Bank", cardType:"Debit", "CustomerName":[{Name:"David", Age:23}]} ... ] ); { "acknowledged" : true, "insertedIds" : [ ObjectId("5eac510d56e85a39df5f6333"), ObjectId("5eac510d56e85a39df5f6334"), ObjectId("5eac510d56e85a39df5f6335") ] }Display all documents from a collection with the help of find() method −> db.demo729.find().pretty();This will produce the following output −{ "_id" : ... Read More