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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 s...
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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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Frameworks vs Libraries vs Services

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Framework, libraries and services are usually overlapped. In this blog post we'll see how are these things different from one another. First let's have a look at framework .. Let's tokenize this word. Framework is composed of two terms. one is frame and second is work. Frame is anything that you can put something into . Like a photo frame, you have some sort of skeleton in which you can put your photo. but the most important thing is that your photo must be of the size of the frame. If this isn't the case then you might need to buy some other frame or you might need to cut your photo from the borders, or the bottom or the sides or from anywhere. (in order to fit it into the frame) The second word is "work" what does work mean... Well according to Physics you are only doing work if and only if some force is applied and you cover displacement in the direction of applied force. But this is not the case with this work word. Here the work is nothing ...
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Data Engineering Tools

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   Data is a new oil. To channelize this data we need proper pipelines. These pipelines are mostly called ETL or data pipelines.  There are various tools out there to work out these Extract, Transform, and Load (ETL) operations.  Some of the scripting tools are:  - Python - SQL and NoSQL Apache provides a wide range of products that can be used as Data Engineering tools.  Some of the amazing apache DE services comprised of; - Hadoop - Spark - Kafka - Cassandra - Hive In addition, some cool DE tools are: - Tableau - Talend - MapReduce These DE tools provide a way to manage the data pipelines in a more effective, efficient, and better way.  Almost every Data-Oriented company in the corporate sector is highly dependent upon these technologies. They are leveraging many of the above-mentioned mechanisms for promising Data Services and Architecture. That's it for today. Hope you have enjoyed this article. If you want to know more about data or software relat...
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Five People to Follow on Social Media

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How many times you used to scroll Facebook, Instagram, Twitter, and other social media platforms? You always want to make your scrolling productive but after 2-3 hours you realize that you have wasted tons of your precious time.  so, if you want to make the best use of your social media time, then you can follow the following people, their posts are meant to give some worthy information. let's get started: Hisham Sarwar  Follow Hisham Sarwar for freelancing related information. Zeeshan Ul Hassan Usmani  Follow Zeeshan Ul Hassan Usmani for data science, artificial intelligence and, block-chain related stuff. Aman Dhattarwal  Follow Aman Dhattarwal for study and placement tips and tricks. Sandeep Maheshwari  Follow Sandeep Maheshwari for business strategies and motivational content. Qasim Ali Shah  Follow Qasim Ali Shah for study motivation as well as life lessons. Enjoy!
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Think Like a Programmer

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How? Read this book Why? Because you are to become a software engineer and programming is the basic need, the food for thought of a software engineer especially a programmer software engineer... But... This is too long So what? You have to read it! May be it contains something that is beneficial to you..
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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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Relational DB, ORM and ERP systems

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When something is getting obsolete, we usually use to say it in Urdu as: Translation:That time has gone... With each passing second data is increasing and to make efficient use of that data we need to store it in some structured form. In past almost all the enterprises used to store data, in rows and columns on paper; like for attendance of staff members, there was a register in which name and corresponding status of attendance is marked. Bills, payment status, resource planning, human resource management, everything was (just) on papers. so yeah, that time has almost gone; when people used to store a lot of data on papers and in files.  Image Source But then technology grew up and paperwork is shifted on digital world. (But, there are still many companies relaying on paper work more than on computers!). So as mentioned above, the problem is; data is expanding. We need to deal with it, we need to manage it properly.  According to Quickbase article on datab...
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Bitcoins : Part 3 : Final

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In today's blog post we will look at the following remaining points: Bitcoin Origin Advantages Disadvantages Books related to it.. Future Assignment code : fun factor :) Conclusion You may wonder why the above list is beginning from "4", this is because we have covered the points: 1,2,3 previously... you can view them here  and here too :)  so without further ado, let's begin .... Bitcoin Origin When ever the word bitcoin comes into my mind, I used to think of the golden foil wrapped coin chocolates, but fortunately or unfortunately that used not to be the case. Actually One fine morning/evening/or on some other time of the day (2008), a person code named; Satoshi Nakamoto   ( People over the Internet are saying they don't know who is Satoshi Nakamoto, whether a person or some company.)  published a paper naming :   A Peer-to-Peer Electronic Cash System . I hope you have read that as I have attached the link to this paper in th...
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