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Both scramjet and Ramjet are types of jet engines. A ramjet is an air breathing jet engine which is usually associated with supersonic transport. Ramjets can start at supersonic speeds only, so as a result they cannot be started at zero velocity and cannot produce thrust as there is a lack of airspeed.Hence assisted take off flights or rockets are needed to or accelerate it to a supersonic speed from which it starts producing thrust. This makes ramjet engine to be efficient only at supersonic speeds as it can accelerate to speeds of about Mach 6. Ramjet has revolutionized Rocket ... Read More
The concept of Guerrilla marketing was created by Jay Conrad Levinson. Traditional marketing involves advertising methods such as advertising on television, radio, print, and mail. Online marketing or Digital marketing is the type of advertising which we see today on websites, YouTube videos, blogs, etc. Whereas, Guerrilla Marketing is an inexpensive method that focuses more on reach rather than frequency. This style of marketing is effective for small businesses to advertise their product and services. One needs to have imagination, energy and time for this kind of advertising.Give an ImpactThis kind of advertising engages the customers with the product and ... Read More
Indexing of ndarrays can be done using the standard python x[obj] syntax, where x is the array and obj the selection.There are three kinds of indexing available −field accessbasic slicingadvanced indexingWhat kind of indexing will be there depends on obj. In this section, we are going to mainly concentrate on basic slicing & advanced indexing.We can divide advanced indexing into two parts −Integer array indexingBoolean indexingBasic SlicingPython basic concept of slicing is extended in basic slicing to n dimensions. As with python slice object which is constructed by giving a start, stop & step parameters to slice function. To get ... Read More
To select multiple sum columns with MySQL query and display them in separate columns, you need to use CASE statement. The syntax is as follows:SELECT SUM( CASE WHEN yourColumnName1=’yourValue1’ THEN yourColumnName2 END ) AS yourSeparateColumnName1, SUM( CASE WHEN yourColumnName1=’yourValue2’ THEN yourColumnName2 END ) AS yourSeparateColumnName2, SUM( CASE WHEN yourColumnName1=’yourValue3’ THEN yourColumnName2 END ) AS yourSeparateColumnName3, . . . N FROM yourTableName;To understand the above syntax, let us create a table. The query to create a table is as follows:mysql> create table selectMultipleSumDemo -> ( -> Id int NOT NULL AUTO_INCREMENT, -> PlayerName varchar(20), -> PlayerScore int, ... Read More
A negative number output can be shown using the Formatter object −Formatter f = new Formatter(); f.format("%12.2f", -7.598); System.out.println(f);Try the below given code to format a Negative Number Output with Parentheses −Formatter f = new Formatter(); f.format("%(d", -50); System.out.println(f);The following is an example −Example Live Demoimport java.util.Formatter; public class Demo { public static void main(String args[]) { Formatter f = new Formatter(); f.format("% d", 50); System.out.println(f); // negative number inside parentheses f = new Formatter(); f.format("%(d", -50); System.out.println(f); } }Output50 (50)
To select the last 6 months records from news table, use the date_sub() function from MySQL since news records are arranged according to date.The syntax is as follows −select *from yourTableName where yourDateTimeColumnName >= date_sub(now(), interval 6 month);To understand the above concept, let us first create a NEWS table with only NEWS ID and the date on which it published −mysql> create table Newstable -> ( -> NewsId int, -> NewsDatetime datetime -> ); Query OK, 0 rows affected (0.66 sec)Insert records in the table using insert command. ... Read More
Yes, you can achieve this in the following two ways.First Approach At the time of creation of a table.Second Approach At the time of writing query.The syntax is as follows.CREATE TABLE yourTableName ( yourDateTimeColumnName datetime default current_timestamp );You can use alter command.The syntax is as follows.ALTER TABLE yourTableName ADD yourColumnName datetime DEFAULT CURRENT_TIMESTAMP;Implement both the syntaxes now.The first approach is as follows.mysql> create table CurrentTimeStampDemo -> ( -> CreationDate datetime default current_timestamp -> ); Query OK, 0 rows affected (0.61 sec)If you do not pass any parameter for the column ‘CreationDate’, MySQL by default stores the current timestamp.Insert record in ... Read More
To load and display an image in iOS app we’ll first need to get an image.Then we’ll drag that image to our project and select copy if required option and our application target.Let’s see the rest with help of an example.Now, we’ll create an UIImageView and assign the image to its image property, for that we’ll create a function.func addImage(imageName img: String) { let imageView = UIImageView() imageView.frame = self.view.frame imageView.contentMode = .scaleAspectFit if let newImage = UIImage(named: img) { imageView.image = newImage } self.view.addSubview(imageView) }Now, we’ll call this code in ... Read More
Teething makes the child more irritable than usual. The child feels a lot of pain and it is; therefore, necessary to provide them comfort during this time.How To Tackle Babies During their Teething Time of Molars?Diet Change: A diet that consists of soup and yogurt is better than solid foods.An Antidote for Pain: Thick end of a chilled, uncut carrot, for instance, can be a good antidote for molar eruption pain.Icy water to help numb the area, so no pain is felt by the toddler.If the toddler is constantly drooling, keep a towel or soft cloth handy to pat his ... Read More
Plastic pollution is the most hazardous and most impactful pollution on earth. Unnecessary piling up of the plastic waste in the Earth's environment is adversely affecting the wildlife, wildlife habitat, and humans. Plastic pollution has its effects on land, water, and air along with plants and animals.The implication for animalsMany times we litter the earth with plastic without knowing the dangers that it can cause to other animals and creatures that also co-exist with us on the same planet. Many animals mistake the plastic that we throw away as food and they eat it. In many cases, it has been ... Read More
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