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Introduction to Galaxy Schema

Hadoop, Data Science, Statistics & others

Essentially, Galaxy schema can be derived as a collection of star schemas interlinked and completely normalized, to avoid redundancy and inaccuracy of data. It can also be a meaningful association of a Snowflake schema with a Star schema, where the fact tables of both schemas can be linked. The Dimension tables from both structures can be linked as per the requirement. The resulting system appears in the structure like a Constellation of stars, wherein fact tables are the stars here. This explains the name Galaxy schema. This type of schema is also called as ‘Fact constellation’ schema, as it has multiple fact tables.

Since this can have both star and snowflake schemas in it, Galaxy Schema is completely normalized. Normalization is nothing but breaking down of information into further more levels, so as to facilitate a meaningful relationship between the fact and dimension tables. This ensures accurate, organized and well-defined data in the system.

Reasons to Choose Snowflake Schema

Usually, the Schema type is chosen based on multiple parameters that are thought to be important for any given Project, by the Project Management team. Here are the basic characteristics of the Galaxy Schema that can help in making the choice,

This model can involve more than one fact table and many dimension tables

All the dimension tables are normalized until there is no more space for further normalization.

Galaxy Schema makes it possible for the data in the Database to be more distinct, in contrast to star schema but similar to snowflake schema.

The Fact Table will have all the facts/ measures, while the Dimension Tables will have foreign keys to connect with the Fact Table.

Galaxy Schema allows the Dimension Tables to be linked to other Dimension tables, including the Dimension Tables in the first level.

This Multidimensional nature makes it easy to implement on complex Relational Database systems, thus resulting in effective Analysis & Reporting processes.

In terms of Accessibility, Complex multiple levels of Join queries are required to fetch aggregated data from the center fact table, using the foreign keys to access all the required Dimension tables, as the system itself is more complex.

Multiple Dimension tables, which are created as a result of normalization, serve as lookup tables when querying with complex multi-level Join queries.

The process of breaking down all the Dimension tables into multiple small Dimensions until it is completely normalized takes up a lot of storage space compared to other schemas.

As the system and querying process is multifaceted, the speed of Data Retrieval from the database systems is by very slow.

Workflow of Galaxy Schema How to Create a Galaxy Schema?

When the system consists of the fact tables A & B that is connected to the Dimension tables C, D, E, F, G, H, I, Galaxy Schema can be structured. Given the rules, fact tables can be connected with one another, and dimension tables can be connected with any fact table and dimension table inside the system, the below example will help in better understanding the underlying concept of a Galaxy Schema.

In this example, the student database has two fact tables – students & Teaching staff. Both the fact tables can have common dimensions – Professional courses, Arts & Science, based on their respective departments. From the student dimension, furthermore, normalization applied to derive co-op and offcampus jobs. This can be further broken down to mention the experience types and internships.

On the other side, the teaching staff will have assignments for students. And, these assignments dimension table can be further normalized to define assessment details. All these dimension tables can be further normalized based on the limitations of the information provided for the designing team by the project.

Pros and Cons of Galaxy Schema


Its multidimensional nature helps in structuring complex Database systems efficiently.

Minimum or no redundancy, as a result of Normalization.

This is a flexible Schema, considering the complexity of the system.

When queried with Joins, clear & accurate data can be extracted.

High Data quality & accuracy helps in creating exceptional Reporting & Analytical results.


Galaxy schema can be Complex in structure.

Working on this schema is tedious, as the complexity in both Schema and database system makes it more intricate all together.

Data retrieval is done with multi-level joins combined with conditional expressions.

The number of levels of normalization is expected, depending on the depth of the given database.

Maintenance and support tasks get difficult as Galaxy schema is applied for larger database systems with complex structures.

Large storage space is required for its larger design arrangement and detailed querying process.

The analysis gets difficult, as it has no limitation on how many fact and dimension tables it can have.

Conclusion Recommended Articles

This is a guide to Galaxy Schema. Here we discuss the workflow of Galaxy Schema by explaining how to create Galaxy Schema? the pros and cons respectively. You can also go through our other suggested articles to learn more –

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How To Learn Java From Scratch In 2023?

According to

Choose Your Way of Learning

Today there are dozens of learning ways available online, you just have to pick up a few that suit you the best. Below we’ve listed some of the most effective methods and resources.  

Online Courses

• CodeGym: Practice by completing 1200+ programming tasks that are related to Java. • Java Programming Masterclass for Software Developers (•  Learning: These nine lessons will help you learn the fundamentals of programming with Java by solving common Java programming challenges.  


If you like reading, books are an amazing way to learn how to code Java step by step. Some of the top books to understand Java and its concepts are: •  : It is the revised version of Manning’s best-selling “Java 8 in Action”. This book enhances your knowledge by linking the latest features of Java to real-life examples. Also, you will get knowledge about recent innovations like Stream API, and Java module system. •  : It is the second-best book for beginners to comprehend the concepts of Java written by Cay S. Horstmann. However, this book is ideal for those who already know C++ language as the author has compared the constructor, template, and generic of C++ language with Java. Therefore you must be good at C++ to grasp the information of this book. •  : Another great book for beginners to acquire the concepts of Java but the information is quite old. It is explaining about Java 1.5 which is nearly 12 years old and Java SE8 has many new features and additions. So we can say that it’s still an efficient resource but needs to be revised according to the latest innovations.  


If you like to study in a group and understand concepts in a better way while discussing a topic with your fellows then you can consider joining a bootcamp program which is an intensive programming training. You can try

Set a Goal For Yourself

It is essential to decide what exactly you’re aiming to achieve. Use the SMART approach while setting your goal. The intention should be specific, measurable, achievable, realistic, and timely. For instance,” I’ll learn Java objectives till 20th March”. You can split your final goal into a few so it’s easier to move step by step. Track your progress constantly so you can see what you’ve already achieved and how far you are from your final goal.  

Practice Regularly

Regular practice is essential when you plan to learn Java. You must start by doing simple tasks, writing down code on a piece of paper, and showing them to a professional who can review it and inform you about your progress.  

Ask for Help

Look out for a decent platform on the internet for software developers, or find a mentor who can help and guide you. Visit forums like Quora, Reddit, and

Don’t Delay Your Job Search

Don’t wait till the end of the entire course, you can start searching for a job as soon as you learn fundamental technologies that are required for a job. Send CVs and plan meetings along with completing your course. You may even get a position in a company before the time you finish your study.  

Wrap Up

Aside from that, it’s good to set specific goals to master your Java skills in a more consistent way.

How To Create Unity 2D Platform

Overview of Unity 2D

3D animation, modelling, simulation, game development & others

Introduction to Unity 2D

Unity 2D games are part of Unity software, which means Unity game is not just famous for 3D games, but we can also create 2D games in it. When we start creating games in Unity, it offers us to create our games in 2D or 3D mode. In 2D games, Sprites are simple objects that deal with graphical images, and while working on 2D games in Unity, we must have a 2D interface selected. We can manage several things in Unity to develop our 2D games, such as making graphical objects as box colloidal, making objects rigid bodies for animating them, and so on.

If you are in the Game interface, you will not be able to see the camera.

And if the 2D interface is disabled then it will change into a 3D mode which will create problems for you in creating a 2D game so make sure you are in 2D mode.

I will name this folder Level.

Same as you can create more folders for better asset management of your 2D game.

Once we choose it, a player of this chosen square will come into the Hierarchy section. Now I will name it Player.

You can also see your external graphics here. So to have a graphical asset for this, I will choose this image from its saved folder. You can use your desired image for this purpose.

Now you can assign your imported image to the Player object.

If it is not visible to you, zoom the area to see your object.

You can scale it as per requirement by the scale options in the Transform section of the selected object. Such as, if I change its X value, then it will change like this.

If you want, you can check how your selected object will look in your created game scene by going to the Game tab of this software.

Now I will go to the Hierarchy section and select the Player layer, then press Ctrl + D to make a copy of it and name it as Floor.

Here I will scale it in the X direction to make this type of floor area for the player.

To add a 2D variable to the object, follow these steps:

Select the object.

Go to the Inspector section.

Search for “Box Collider 2D” in the component search bar.

Now do the same for the Floor object in the same way.

For adding animation to our player object, search for Rigidbody 2d in the same Add Component button after selecting the Player layer.

Unity 2D Platform

Now let me tell you about what a 2D platform is in Unity. First, there is an asset store offered by Unity to make our 2D game development easy. Through Asset Store, we can import many pre-designed assets of 2D games.

Once you choose this option, Asset Store will open like this. In the search box, you can search for your desired assets, such as for 2D platform assets; search here for 2D platform in the s

Once it gets added, you can go with the Open in Unity or Go to My Assets option and work with it.

These were some important facts about 2d games creation and development in Unity software.


After going through this article, you have good information about 2d Unity games and an idea about how you can create 2d games in it. You can go with the Asset store for having a preset of a 2d game platform to make your 2d game development easy. There is a free 2d platform, so you can try it for free before going for a paid one.

Recommended Articles

This is a guide to Unity 2D. Here we discuss the Introduction, overview, Unity 2D platform, and how to create the Unity platform, respectively. You may also have a look at the following articles to learn more –

How To Create Accordion In Reactjs?

A UI element called an accordion enables user to expand and compress content portions. A great method to add interactivity to your online application and make it simpler for visitors to explore and find the information they need is to create an accordion in ReactJS.

This article will walk you through the steps required to create an accordion in ReactJS and provide sample code to get you started.

Step 1: Setting up the React Project

To get started, you must have a React project set up. The create-react-app command can create a new project if you don’t currently have one.

npx create-react-app my-app cd my-app npm start

This creates a new project in the directory “my-app” and launches a development server so you can preview your changes online.

Step 2: Creating the Accordion Component

After setting up a fundamental React project, we can develop a new component for our accordion. In the project’s src directory,create a new file called chúng tôi


import React, { useState } from 'react'; function Accordion({ items }) { const [activeIndex, setActiveIndex] = useState(-1); setActiveIndex(index === activeIndex ? -1 : index); }; return ( ))} ); } export default Accordion;

We are importing React and the useState hook from the react package into this code.

Additionally, we render the accordion items by iterating through the items parameter using the map method.

Step 3: Adding the Accordion to the App

We need to incorporate the accordion component into our app now that we have it. The Accordion component will be imported into the chúng tôi file and added to the JSX in order to accomplish this.


import React from 'react'; import Accordion from './Accordion'; const items = [ { title: "Section 1", content: "This is the content of section 1" }, { title: "Section 2", content: "This is the content of section 2" }, { title: "Section 3", content: "This is the content of section 3" } ] function App() { return ( ); } export default App; Step 4: Styling the Accordion

Finally, we may style our accordion to make it appear more aesthetically pleasing. This may be accomplished by importing a CSS file into our chúng tôi code and inserting it there.

import './Accordion.css';

chúng tôi

/* chúng tôi */ button { padding: 8px 20px; background-color: #4CAF50; color: white; border: none; cursor: pointer; margin-right: 10px; } p { font-size: 20px; margin-top: 20px; } /* chúng tôi */ button:hover { background-color: #3e8e41; } button:active { transform: scale(0.95); } button:focus { outline: none; }

To enable the user to close and open all the accordion items, two new buttons, “Close All” and “Open All,” as well as two new event handlers, “handleClose All” and “handleOpen All,” have been added to this code.

Step 5: Making the Accordion Responsive

Using CSS media queries, we can style the component differently depending on the size of the screen to make the accordion responsive. When the screen width is less than 500px, for instance, we can alter the font size of the content of the accordion.

/* chúng tôi */ @media screen and (max-width: 500px) { p { font-size: 16px; } }

We can also use flexbox to make the component take up the full width of its container on small screens.

/* chúng tôi */ .accordion-container { display: flex; flex-wrap: wrap; justify-content: center; }

After following these instructions, your ReactJS application should have a responsive and fully functional accordion. This accordion can be further expanded upon and altered to meet the unique requirements of your application. But bear in mind that there are a variety of additional approaches to accomplish the same goal when building an accordion with ReactJS.

To ensure that the active accordion item remains visible even after a page refresh, you might also include the option to save it in local storage. To make the accordion more visually pleasing, you may also include the capability to animate the accordion elements when they are opened and closed.



Using the provided sample code, you should be able to create a basic accordion that may later be enhanced to match the specific needs of your application. Just bear in mind that there are many other methods to use ReactJS to create an accordion and achieve the same result. By following the instructions in this blog post, you can create an accordion that can be helpful for organizing and displaying material in your ReactJS application.

How To Create And Add Intellij Javafx?

Introduction to IntelliJ JavaFX

Basically, IntelliJ provides different types of features to the user, JavaFX is one of the features provided by IntelliJ. Normally JavaFX is nothing but a set of media and a graphics package, which helps the developer to create, design, test, deploy and debug the application. Mainly it provides consistency across different platforms we use for deployment, and it totally depends on the user requirement.

Start Your Free Software Development Course

Web development, programming languages, Software testing & others

What is IntelliJ JavaFX?

JavaFX is a bunch of illustrations and a media bundle that empowers engineers to configure, make, test, investigate, and send rich client applications that work reliably across different platforms. The look and feel of JavaFX applications can be tweaked. Flowing Style Sheets (CSS) separate appearance and style from execution so engineers can focus on coding. Visual creators can without much of a stretch, tweak the appearance and style of the application through the CSS. If you have a website composition foundation, or on the other hand on the off chance that you might want to isolate the UI (UI) and the back-end rationale, then you can foster the show parts of the UI in the FXML prearranging language and use Java code for the application rationale. If you like to plan UIs without composing code, use JavaFX Scene Builder

How to Create IntelliJ JavaFX?

1. First, we need to open IntelliJ.

4. Here we can change the project name as per our requirement as well as we are also able to change location if required after that select language and build the system.

From the above list, we can list all the required libraries which are shown in the screenshot above.

How to Add IntelliJ JavaFX?

Now let’s see how we can add IntelliJ JavaFX as follows:

First, we need to download the JavaFX, it is a zipped folder and downloaded as JavaFX-SDK, so first, we need to unzip this folder and move it into our permanent location on our system.

Here instead of the module path, we can use the actual path of the JavaFX SDK which is kept on our local machine.

IntelliJ JavaFX Applications

JavaFX is a product stage to configure, make, test, and send different stages Graphical User Interface applications, Rich Internet Applications, and Desktop Applications.

Now let’s see the structure of JavaFX, basically, it contains the three major parts as follows.

Stage: It is used to store the objects of JavaFX and it is shown as a stage class. Five type’s stages are present in JavaFX as Decorated, Unified, Unity, Transparent and Undecorated.

Scene: It is used to show the physical contents of the JavaFX application.

Scene Graph and Nodes: It is used to show the hierarchical structure.

And there are three types of nodes: root node, branch node, and leaf node.


In the above point, we already see how to create a project, so here we use an already created project as shown in the below screenshot.

package com.example.sampledemo; import javafx.application.Application; import javafx.fxml.FXMLLoader; import javafx.scene.Scene; import javafx.stage.Stage; import; public class demo extends Application { @Override public void begging(Stage stage) throws IOException { FXMLLoader fxmlLoader = new FXMLLoader(HelloApplication.class.getResource("hello.fxml")); Scene s_obj = new Scene(fxmlLoader.load(), 220, 180); stage.setTitle("Hi"); stage.setScene(scene);; } public static void main(String[] args) { launch(); } }


After execution, we will get the below result.

Key Takeaways

JavaFX provides different types of GUI features such as views, audio, video playback, animation, etc.

It provides better bindings for the property system.

It provides different CSS styling.

It provides the built animation system, when we work with JavaFX then it is much easier to understand different APIs.


Given below are the FAQs mentioned:

Q1. What makes JavaFX better than Swing? Q2. How does JavaFX help us?

Answer: Normally it provides the best UI component on the Java platform, and we know that Java is one of the best coding languages for general purpose development as well as it provides all the required libraries for desktop applications.

Q3. What is the basic difference between Java and JavaFX?

Answer: Java is nothing but a Swing toolkit and on the other hand JavaFX provides different types of UI components to make a modern user interface.


In this article, we are trying to explore the Intellij JavaFX. We have also learned the basic ideas of Intellij JavaFX as well as what are the uses, and features. Another point from the article is how we can see the basic implementation of the Intellij JavaFX.

Recommended Articles

This is a guide to IntelliJ JavaFX. Here we discuss the introduction and how to create and add IntelliJ JavaFX along with applications and examples. You may also have a look at the following articles to learn more –

How To Create Customized Google Assistant Commands

Wouldn’t it be nice if Google Assistant performed more than one task with a word that only you know? Besides the typical commands to show you the weather, you can make Google Assistant open specific apps in the order you want.

For example, with one word you can have it show you the news and open WhatsApp for you. If you have a routine where you usually open the same apps in the same order, this can be a real timesaver.

How to Create Personalized Google Assistant Commands

To create your own Assistant Command, open the Google app and tap on the hamburger icon at the bottom-right. Tap on Settings (second to last option) at the bottom, and under Google Assistant select Settings.

In the following page tap on the Assistant tab, and select Routines. Google Assistant will already have some commands ready for you to use. Pressing the blue button at the bottom-right, you can create your own.

Once you’re in the New routine page, tap on “Add commands” to add the word that will trigger the actions. Below, you will see the “Add action” option. After you select it, you can either choose from popular actions such as “tell me about the weather,” “tell me about my commute home,” “broadcast I’m home,” “read unread texts” and many more.

How to Personalize Your Google Assistant Commands

If there’s an action that needs more information such as a phone number, tap on the cog wheel to the side to add the additional information.

When you’re done adding your action, don’t forget to tap on “Add option” at the top to save your changes. The same applies when you personally add the action you want Google Assistant to perform. If you wish to add more actions, keep tapping on the “Add action” option.

You can also change the order of the actions in a particular routine Tap on a routine and then on the option that says “Change Order.” You’ll see a list of all the actions. Long-press and slide the actions to the order you want. To save your changes, merely tap on the back button, and it will be saved.

You can also add media to your routine. Tap on the “Add media” option, and you can add audio such as music, news, radio, podcasts, audiobooks, and even sleep sounds. Each of these media options can be customized. For example, if you choose to hear the news, tap on the cog wheel, and either add or remove a new source.

When you’re done adding all the actions, tap on the checkmark at the top to save everything. Your newly created routine should appear on the Custom list automatically.


Fabio Buckell

Just a simple guy that can’t enough of Technology in general and is always surrounded by at least one Android and iOS device. I’m a Pizza addict as well.

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