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joja [24]
2 years ago
12

Why do relational databases use primary keys and foreign keys?.

Computers and Technology
1 answer:
Andrew [12]2 years ago
8 0

Answer:

Explanation:

A relational database is designed to enforce the uniqueness of primary keys by allowing only one row with a given primary key value in a table. A foreign key is a column or a set of columns in a table whose values correspond to the values of the primary key in another table.

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How would you write this using Java: Use a TextField's setText method to set value 0 or 1 as a string?
katrin [286]

Answer:

Explanation:

The following Java code uses JavaFX to create a canvas in order to fit the 10x10 matrix and then automatically and randomly populates it with 0's and 1's using the setText method to set the values as a String

import javafx.application.Application;

import javafx.scene.Scene;

import javafx.scene.control.TextField;

import javafx.scene.layout.GridPane;

import javafx.stage.Stage;

public class Main extends Application {

   private static final int canvasHEIGHT = 300;

   private static final int canvasWIDTH = 300;

   public void start(Stage primaryStage) {

       GridPane pane = new GridPane();

       for (int i = 0; i < 10; i++) {

           for (int j = 0; j < 10; j++) {

               TextField text = new TextField();

               text.setText(Integer.toString((int)(Math.random() * 2)));

               text.setMinWidth(canvasWIDTH / 10.0);

               text.setMaxWidth(canvasWIDTH / 10.0);

               text.setMinHeight(canvasHEIGHT / 10.0);

               text.setMaxHeight(canvasHEIGHT / 10.0);

               pane.add(text, j, i);

           }

       }

       Scene scene = new Scene(pane, canvasWIDTH, canvasHEIGHT);

       primaryStage.setScene(scene);

       primaryStage.setMinWidth(canvasWIDTH);

       primaryStage.setMinHeight(canvasHEIGHT);

       primaryStage.setTitle("10 by 10 matrix");

       primaryStage.show();

   }

   public static void main(String[] args) {

       Application.launch(args);

   }

}

3 0
3 years ago
A(n) ______ is a type of collaborative website that allows users to create, add, modify, or delete website content.
andrey2020 [161]
<span>A wiki is this type of site. The users can, anonymously or with a profile, add to or delete content already posted. This gives the community the ability to add to the overall knowledge base on a specific subject. The site tracks changes through IP addresses to make sure that changes are not done maliciously.</span>
8 0
3 years ago
During prereading, it is not important to pay attention to visual aids. please select the best answer from the choices provided
Nadusha1986 [10]
True Because the visual aids will provide better hand to eye coordination
7 0
2 years ago
Explain the unique reason why assember language is perfered to high level language
Zigmanuir [339]

The unique reason why assembler language is preferred to high level language is that  It is said to be memory efficient and it is one that requires less memory.

<h3>Why is assembly language better than other kinds of high level?</h3>

It implies means that the programs that one uses to write via the use of high-level languages can be run easily on any processor that is known to be independent of its type.

Note that it is one that has a lot of  better accuracy and an assembly language is one that carries out a lot of better functions than any high-level language, in all.

Note also that the advantages of assembly language over high-level language is in terms of its Performance and accuracy as it is better than high-level language.

Hence, The unique reason why assembler language is preferred to high level language is that  It is said to be memory efficient and it is one that requires less memory.

Learn more about assembler language from

brainly.com/question/13171889

#SPJ1

3 0
2 years ago
Tyra used the software development life cycle to create a new game. After debugging and documenting code, she released it to her
REY [17]

Answer:

Maintenance

Explanation:

Maintenance

This primarily involves updating and making improvements based on user feedback, as well as resolving any defects that arise.

6 0
3 years ago
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