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Data Modeling

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source: https://searchdatamanagement.techtarget.com/definition/data-modeling A wise person once said a picture is worth a thousand words . In real-world data is not just a few rows of excel sheet, yet it comprises several billion rows expanded through hundreds  of tables. A table is usually made up of rows and columns. Each table represents an Entity . Entity means an Object or thing. That Entity has several properties called Attributes . Those attributes represent the qualities or characteristics of the entity. Since there is more than one entity, so there should be a Relationship between those entities. If we look at the tables we cannot get a clear idea of the relationship between several tables/Entities. Hence, we need to represent the tables/data in the form of a picture or a flow graph. That flow graph or Entity-Relationship diagram is called a Data Model .  Data Modeling is a technique to represent how the tables are related to each other and to represent the structure of da
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1-Machine Learning : Start...

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John went to the cafeteria 10 times at 1:00 P.M. on 10 Fridays, each time the cafeteria was closed at that particular time. John decided not to go to cafe at 1:00 P.M. on Friday because the cafe will be closed.  But wait! How did John know that the cafe will  also be closed on next Friday at 1:00 P.M.??? Yes, you are absolutely right.  "John Learned from his Experience that the Task of going to the cafeteria at 1:00 P.M. on Fridays resulted in waste of time, since the cafe was closed on each Friday, so it will Perform the same on the next Friday." In the above scenario, John learned something so we can call it " John Learning ". Similarly, if we replace John with some sort of Machine, that can learn from the Experience or from the History about how the tasks were performed in the past given certain situation. Such that the Machine will perform the same if the same task happen again in near future. Then this will be called as Machine Learning. To mak
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An Interview with Pakistani Data Scientist : Dr. Zeeshan Ul Hassan Usmani

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Dr. Zeeshan-ul-Hassan Usmani, the name known for Data Science, Predictify me, Eisenhower fellowship  and most importantly motivation for many of the students. He is the Author of book like  (C++) ++سی/سی ,  Bit Coin Block Chain aur Crypto Currency بٹ کوائن، بلاک چین اور کرپٹو کرنسی  and many other, you can visit them here . Today "Data Science Tales - A Tech blog by Bia Chaudhry," asked him some of the questions, as an interview and we are very glad that he gave his precious time to answer them. It was kinda "Remote Interview"... not the traditional one.. The Interview Question:  How can you describe " Dr. Zeeshan ul Hassan Usmani " ? ANSWER: I am a shameless idealist. We are all idealists at some stage of our lives but then it fades away and we live as a mediocre. I don’t want it to fade away. I remind myself almost every day that I need to make my today better than my yesterday, and the challenge is keep getting harder J . We onl
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Relational Data Model

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In the previous blog post, we covered Data Modeling. We have seen that data modeling is really important before jumping into predictive modeling.  In this article, we will cover the Relational Data Model (RDM). Let's start from the very basics, relational means anything which is linked with some other thing. This link is called "Relationship". In RDM or RM there are major three types of relationship cardinalities (also called Multiplicities or Cardianalities): 1. One to one 2. One to many 3. Many to many We can understand these with the help of a few simple examples;  One to one: One department has one manager. One to many: One class has many students. Many to many: Many teachers can teach many students. Okay, so we have got an abstract overview of the term " Relational ", now the next thing is " Data ", data covers everything, anything... And finally, " Model " means something in the form of a template, design, a kind of blueprint.  To store
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How to play Chess ?

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Have you ever thought of two chess players sitting in front of each other; as Genius ?  When I used to see people playing chess, I thought of them as the most genius people because chess is a quite challenging and strategic game. You need to have full focus in this game, if you are not focused for just a bit; you may lose the game ! I think, we can use chess to stay focused, because these days we are losing focus, which is most required. So let's go through some of the simple rules that can help us to play chess: . . . . . . . . . . Whaaaattt nothing shown above ? Am I kidding ??? Well, don't worry. go and create your account here :  Chess dot com   Then start learning chess because "Mainly : The Software Engineering Blog" does not compromise on quality that is why, I am providing a really awesome site to learn and play chess !  This blog post is not sponsored at all ! Happy Playing :)
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Pintos : Series : Part 1 : Installation

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PintOS is an Operating system, but this is not a complete OS. There are many kernel level functions implemented but we need to modify it to implement it correctly. So, if you are taking OS course or interested in Operating Systems then you can follow my PintOS Series. As installation of PintOS is the most important and tedious task, so we need to do it first! Actually I have learnt about the installation steps from various sites, I will share their links side by side. What I grasped from there, I will compose it into this post. I know you might be thinking if the installation steps are already available on-line, then why am I writing them for you? The reason for this is that, when I installed PintOS, I found a lot of problems initially but then it worked. So, what I understood from my experience and from the sites, I will share that. I believe that if learning is done through mutual cooperation,  then this will benefit everyone . So, let's learn together.... First Mist
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Pintos : Series : Part3 : Project 1 : Alarm Clock

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The PintOS project has 27 test cases that we need to pass. In the first project we are just going for the five test cases related to alarm clock that are as under: alarm_multiple alarm_single alarm_simultaneous alarm_negative alarm_zero But before jumping into the code, let's first understand the basic structure of PintOS and how it runs. Consider the following diagram: Here QEMU is an emulator on which pintOS runs. Test cases are the processes that we run on the PintOS (Operating System). So we only need to modify the PintOS code, we are not allowed to make any change to the test cases code as this would be a cheating. When you open up the PintOS directory, in tests/threads/tests.c all the test cases are declared. And in the tests/threads/ directory you can observe files with the extension " .ck " and " .c ". So the " test_Name.c " files are the files in which test cases are defined, while " test_Name.ck " file
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Applications of Data Engineering

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In a previous blog post about data engineering, we went through several many concepts related to data engineering such as data modeling, and then we went through different types of databases, for example, relational databases and we also got a glimpse of relational as well as NoSQL databases. And in today's blog post we will be writing about data engineer applications. Which are basically the use cases of data engineering 1st let's see what data engineering applications mean; so basically when we have data and we have engineered it then there are several things that we can do with that data and these things that we can do with processed data are the use cases of the data engineering. For example: If we have filled our containers with the data then it's not of any good use if it is not clean and well-formed. If your data is well-formed and if there are no logical mistakes, missing values, and garbage then we can easily perform the use cases and applications of data enginee
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E-Commerce : Platforms

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Before digging into E-commerce platforms, let's first understand what an E-commerce actually is? E-Commerce... According to the Tokenization Rule , E-commerce is the combination of "E" and "Commerce".  The word Commerce means trade or buying and selling of items, goods, services, hardwares and, softwares... etc. And " E " stands for "Electronic", electronic means something like electricity, like signals, like something in the form of electrons (at lower level).  Image Source So, the word " E-COMMERCE " means: " A type of trade, that is done using electronic devices (computer, mobile or ATM machines etc). "   And to achieve electronic commerce, what's the most important thing? think over it!  Yeah that's correct! your own Internet is the most important thing to do E-commerce.  Major areas of E-commerce are: On-line shopping or retailing On-line bidding or auction On-line soft
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