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You can use aggregate() method along with $sort() 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.aggregationSortDemo.insertOne({"StudentId":98, "StudentFirstName":"John", "StudentLastName":"Smith"}); { "acknowledged" : true, "insertedId" : ObjectId("5c90140c5705caea966c5587") } > db.aggregationSortDemo.insertOne({"StudentId":128, "StudentFirstName":"Carol", "StudentLastName":"Taylor"}); { "acknowledged" : true, "insertedId" : ObjectId("5c90141b5705caea966c5588") } > db.aggregationSortDemo.insertOne({"StudentId":110, "StudentFirstName":"David", "StudentLastName":"Miller"}); { "acknowledged" : true, "insertedId" : ObjectId("5c90142f5705caea966c5589") } > db.aggregationSortDemo.insertOne({"StudentId":139, "StudentFirstName":"Chris", "StudentLastName":"Brown"}); { "acknowledged" : true, "insertedId" : ObjectId("5c90146a5705caea966c558a") } > db.aggregationSortDemo.insertOne({"StudentId":125, "StudentFirstName":"Sam", "StudentLastName":"Williams"}); { "acknowledged" : true, ... Read More
This example demonstrates How to declare global variables in Android?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. In the above code, we have taken text view to show global variable.Step 3 − Add the following code to src/MainActivity.javapackage com.example.myapplication; import android.os.Build; import android.os.Bundle; import android.support.annotation.RequiresApi; import android.support.v7.app.AppCompatActivity; import android.view.View; import android.widget.TextView; public class MainActivity extends AppCompatActivity { TextView actionEvent; @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP) @Override protected void onCreate(Bundle ... Read More
In this section we will see what are the differences between macros and functions in C. The macros are pre-processed, so it means that all the macros will be preprocessed while it is compiled. The functions are not preprocessed, but compiled.In macros no type checking is done, so it may occur some problems for different types of inputs. In the case of functions, this is not done. Also for macros if the inputs are not properly maintained, then it may generate some invalid results. Please check the following program to get the idea about the problem.Example#include #define SQUARE(x) x ... Read More
In this program, we will see how to count the number of 1’s in an 8-bit number stored in register B.Problem StatementWrite 8085 Assembly language program to count the number of 1s in 8-bit number stored in register B.DiscussionIn this program, we are using the rotate operation to count the number of 1’s. As there are 8 different bits in 8-bit number, then we are rotating the number eight times. we can use RRC or RLC. Here we have used the RRC instruction. This instruction sends the LSb to MSb also to carry flag. So after each iteration, we can ... Read More
Binary Search and Sequential or Linear Search both are used in computer programming to search an element. The time complexity of Binary Search is O(log(n)) and Sequential Search is O(n).AlgorithmBegin Algorithm for Binary Search: BinarySearch() function with ‘arr’ the array of data and ‘n’ the number of values, start and end index, iteration count and element to be searched in the argument list. Increment iteration counter and compare the item value with the a[mid]. If item < a[mid] choose first half otherwise second half to proceed further. Return iteration value on successful search. EndExample Code#include ... Read More
To delete document from a collection in MongoDB, you can use the deleteOne() method. Let us first create a collection and insert some documents to it:> db.deleteDocumentsDemo.insert({"Name":"Larry", "Age":23}); WriteResult({ "nInserted" : 1 }) > db.deleteDocumentsDemo.insert({"Name":"Mike", "Age":21}); WriteResult({ "nInserted" : 1 }) > db.deleteDocumentsDemo.insert({"Name":"Sam", "Age":24}); WriteResult({ "nInserted" : 1 })Now display all the documents from the collection. The query is as follows:> db.deleteDocumentsDemo.find().pretty();The following is the output:{ "_id" : ObjectId("5c6ab0e064f3d70fcc914805"), "Name" : "Larry", "Age" : 23 } { "_id" : ObjectId("5c6ab0ef64f3d70fcc914806"), "Name" : "Mike", "Age" : 21 } { "_id" : ObjectId("5c6ab0f864f3d70fcc914807"), "Name" : "Sam", ... Read More
A declaration declares one or more variables or methods that you can use in Java code later in the JSP file. You must declare the variable or method before you use it in the JSP file.Following is the syntax for JSP Declarations −You can write the XML equivalent of the above syntax as follows − code fragment Following is an example of Object declaration in JSP Declarations −
Assume we already have a table named MyTable in the database with the following description.+-------+--------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +-------+--------------+------+-----+---------+-------+ | Name | varchar(255) | YES | | NULL | | | image | blob | YES | | NULL | | +-------+--------------+------+-----+---------+-------+If you need to ... Read More
An immutable copy of a LocalDateTime with the year altered as required is done using the method withYear() in the LocalDateTime class in Java. This method requires a single parameter i.e. the year that is to be set in the LocalDateTime and it returns the LocalDateTime with the year altered as required.A program that demonstrates this is given as follows −Example Live Demoimport java.time.*; public class Main { public static void main(String[] args) { LocalDateTime ldt1 = LocalDateTime.parse("2019-02-18T23:15:30"); System.out.println("The LocalDateTime is: " + ldt1); ... Read More
The sorted() method of the LongStream class in Java returns a stream with the elements of this stream in sorted order.The syntax is as follows −LongStream sorted()To use the LongStream class in Java, import the following package −import java.util.stream.LongStream;Create a LongStream and add some elements −LongStream longStream = LongStream.of(80L, 35L, 15L, 70L, 30L, 45L);Now, sort the elements of the stream −longStream.sorted() The following is an example to implement LongStream sorted() method in Java −Example Live Demoimport java.util.stream.LongStream; public class Demo { public static void main(String[] args) { LongStream longStream = LongStream.of(80L, ... Read More