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SQL Interview Success: Unlocking the Top 5 Frequently Asked Queries

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 Here are the five top commonly asked SQL queries in the interviews. These you can expect in Data Analyst, or, Data Engineer interviews. Top SQL Queries for Interviews 01. Joins The commonly asked question pertains to providing two tables, determining the number of rows that will return on various join types, and the resultant. Table1 -------- id ---- 1 1 2 3 Table2 -------- id ---- 1 3 1 NULL Output ------- Inner join --------------- 5 rows will return The result will be: =============== 1  1 1   1 1   1 1    1 3    3 02. Substring and Concat Here, we need to write an SQL query to make the upper case of the first letter and the small case of the remaining letter. Table1 ------ ename ===== raJu venKat kRIshna Solution: ========== SELECT CONCAT(UPPER(SUBSTRING(name, 1, 1)), LOWER(SUBSTRING(name, 2))) AS capitalized_name FROM Table1; 03. Case statement SQL Query ========= SELECT Code1, Code2,      CASE         WHEN Code1 = 'A' AND Code2 = 'AA' THEN "A" | "A

2 Top Real-time AI New Approaches for Learners

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Artificial Intelligence (AI) applications in real-time have two approaches. Those are Applied and Generalized. This post tells you the differences between these two. Artificial Intelligence (AI). Artificial Intelligence is the broader concept of machines being able to carry out tasks in a way that we would consider smart. How the AI started.  A machine, which has reproducing capabilities, basic arithmetic, and memory are called logical-machines. As enter into a new era, a new thought process created now called AI (Artificial Intelligence) AI Approaches Artificial intelligence has two approaches - Applied and Generalized.  Applied Artificial Intelligence.   The Applied AI is, you can find in systems designed to trade the Stocks or maneuver an autonomous vehicle would fall into this category.  Generalized Artificial Intelligence.   Systems or devices that can, in theory, handle any task – are less common, but this is where some of the most exciting advancements are happening today. Mach

Scala: Unique features you need to know

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Let us start it in layman terms... Why you need Scala... The name Scala stands for “scalable language.” The language is so named because it was designed to grow with the demands of its users. Where Scala can be applied... You can apply Scala to a wide range of programming tasks, from writing small scripts to building large systems.   The real use of Scala... Scala is easy to get into. It runs on the standard Java platform and interoperates seamlessly with all Java libraries. It’s quite a good language for writing scripts that pull together Java components. But it can apply its strengths even more when used for building large systems and frameworks of reusable components. Technically, Scala is a blend of object-oriented and functional programming concepts in a statically typed language. The fusion of object-oriented  and functional programming shows up in many different aspects of Scala; It is probably more pervasive than in any other widely used language.

Why You need DevOps: Quick 5 Minutes Quiz

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Here's a quiz According to EDUREKA, DevOps is a philosophy, a cultural shift that merges operations with development and demands a linked toolchain of technologies to facilitate collaborative change. Why DevOps needed? Since the DevOps philosophy is still at a very nascent stage, the application of DevOps, as well as the bandwidth required to adapt and collaborate, varies from organization to organization, yet we can talk about a winning formula of skills that can present you as a perfect candidate for any type of organization. Which Skill DevOps Engineer should have? ON TOP OF web languages such as Ruby, Python, PHP, or Java, the ideal DevOps engineer should have some experience using infrastructure automation tools like Chef, Puppet, Ansible, SaltStack or Windows PowerShell DSC. QUIZ Link

8 top AWS tricky interview Questions

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In this post, I have explained AWS (Amazon Web Services) tricky interview questions. The EBS, AMI, S3 and Amazon instance included in my questions Q1. Explain Elastic Block Storage? What type of performance can you expect? How do you back it up? How do you improve performance? A1. EBS is a virtualized SAN or storage area network. That means it is RAID storage to start with so it’s redundant and fault-tolerant. If disks die in that RAID you don’t lose data. Great! It is also virtualized, so you can provision and allocate storage, and attach it to your server with various API calls. No calling the storage expert and asking him or her to run specialized commands from the hardware vendor.   Performance on EBS can exhibit variability . That is it can go above the SLA performance level, then drop below it. The SLA provides you with an average disk I/O rate you can expect. This can frustrate some folks especially performance experts who expect reliable and consistent disk through

3 Best Ways to Learn AWS on Weekends

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Amazon web services are one of the popular skills. So, many developers started adding this skill to their list. Due to digital transformation, companies started giving more weightage to the developers who have AWS skills. How to Learn AWS I want to share in this post how to learn AWS quickly.  The idea is to use your weekends to learn AWS.  My learning plan to allocate 5 hours a week. You can take out 2 hours  Saturday and 3 hours Sunday time for this learning. 3 Best Ways to Learn AWS on Weekends  As I said in my previous post   basic interview questions on Amazon web services really a quick start. 3 Best Ways to Learn AWS During Weekends. What is next how to start learning and be industry-ready. You need to have a good  laptop to begin your learning. If it is Ubuntu pre-installed one, really this is good for your study and practices... What materials online you need to refer to. This is basically a question for the developer. Just begin with AWS manuals published

7 AWS Interview Questions asked in Infosys, TCS

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Here are seven amazing Infosys AWS interview questions for your quick reference. These are also asked in TCS. Infosys and TCS AWS interview questions 1). What is AWS? Amazon Web Services (AWS) provides on-demand computing resources and services in the cloud, with pay-as-you-go pricing. For example, you can run a server on AWS that you can log on to, configure, secure, and run just as you would a server that's sitting in front of you 2). What you can do with AWS? Store public or private data. Host a static website. These websites use client-side technologies (such as HTML, CSS, and JavaScript) to display content that doesn't change frequently. A static website doesn't require server-side technologies (such as PHP and ASP.NET). Host a dynamic website or web app. These websites include classic three-tier applications, with web, application, and database tiers. Support students or online training programs. Process business and scientific data. Handle peak loads. AWS Quest

5 Killer Quora Answers on Amazon EBS

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Amazon Elastic Block Store (Amazon EBS) provides persistent block storage volumes to use with Amazon EC2 instances in the AWS Cloud. Each Amazon EBS volume is automatically replicated within its Availability Zone to protect you from component failure, offering high availability and durability.  Amazon EBS volumes offer the consistent and low-latency performance needed to run your workloads. With Amazon EBS, you can scale your usage up or down within minutes—all while paying a low price for only what you provision.  Amazon EBS Features. Choose between solid-state disk (SSD)-backed or hard disk drive (HDD)-backed volumes that can deliver the performance you need for your most demanding applications. Availability: Each Amazon EBS volume is designed for 99.999% availability and automatically replicates within its Availability Zone to protect your applications from component failure. Encryption: Amazon EBS encryption provides seamless support for data-at-rest and data-in-transit between