Let us first create a collection with a document −>db.replacingEntireDocumentDemo.insertOne({"StudentFirstName":"John", "StudentLastName":"Smith", "StudentCountryName":"US"}); {    "acknowledged" : true,    "insertedId" : ObjectId("5cd3119bb64f4b851c3a13e8") }Following is the query to display document from a collection with the help of find() method −> db.replacingEntireDocumentDemo.find().pretty();This will produce the following output −{    "_id" : ObjectId("5cd3119bb64f4b851c3a13e8"),   ... Read More

You can use $pull operator to remove a string from an array. Let us first create a collection with documents −> db.removeAStringDemo.insertOne({"Score":[45, 67, 89, "John", 98, 99, 67]}); {    "acknowledged" : true,    "insertedId" : ObjectId("5cda5224b50a6c6dd317adbd") }Following is the query to display all documents from a collection with the ... Read More

Here we will see the wprintf() and wscanf() functions in C. These are the printf() and scanf() functions for wide characters. These functions are present in the wchar.hThe wprintf() function is used to print the wide character to the standard output. The wide string format may contain the format specifiers ... Read More

Let us first create a collection with documents −> db.embeddedDocumentDemo.insertOne( ...    { ...       "CustomerDetails":[ ...          {"CustomerName":"Chris", "CustomerPurchasePrice":3000}, ...          {"CustomerName":"Robert", "CustomerPurchasePrice":4500}, ...          {"CustomerName":"David", "CustomerPurchasePrice":1000}, ...       ] ...    } ... ); { ... Read More

You can use $elemMatch operator for this. Let us first create a collection with documents −> db.pushNewItemsDemo.insertOne(    {       "_id" :1,       "StudentScore" : 56,       "StudentOtherDetails" : [          {             "StudentName" : "John", ... Read More

In the cmath library of C++, there are different functions for getting the square root except from sqrt. The sqrt is used basically for double type input. The others are used for float, long type data etc. Let us see the usage of these functions.The sqrt() FunctionThis function is used ... Read More

To prevent resizing columns, use the method setResizingAllowed(). Here, we will set setResizingAllowed() to false for table header to disallow resizing of columns from header −table.getTableHeader().setResizingAllowed(false);Let us first see an example wherein we can easily resize columns in a table by resizing the table column header −Examplepackage my; import java.awt.Color; ... Read More

Let’s say you have saved the Login date of users. Now, you want the count of records for specific date only i.e. login date. For this, use $gte and $lt operator along with count(). Let us first create a collection with documents −> db.findDataByDateDemo.insertOne({"UserName":"John", "UserLoginDate":new ISODate("2019-01-31")}); {    "acknowledged" : ... Read More

Here we will see what are the different types of C functions based on the return values and arguments.So a function either can take some arguments, or nothing is taken. Similarly, a function can return something, otherwise does not return anything. So we can categorize them into four types.Function with ... Read More

A Json array is an ordered collection of values that are enclosed in square brackets i.e. it begins with ‘[’ and ends with ‘]’. The values in the arrays are separated by ‘, ’ (comma).Sample JSON array{    "books": [ Java, JavaFX, Hbase, Cassandra, WebGL, JOGL] }The json-simple is a ... Read More