Difference between UNION vs UNION ALL in SQL? Example

Hello guys, what is the difference between UNION vs UNION ALL is one of the most popular SQL interview questions and often asked programmers during a telephonic round of interviews. Though both UNION and UNION ALL is used to combine results of two SELECT queries, the main difference between them is that UNION doesn't include duplicate record but UNION ALL does. Another difference between them is that UNION ALL is faster than UNION but may look slow because it returns more data which takes more time to travel via the network. The difference between UNION and UNION ALL can be a tricky SQL question, especially for developers, who have not used this useful keyword ever. 

Can you join two unrelated tables in SQL? Cross Join Example

In one of the recent programming job interviews, one of my readers was asked the question, how do you join two tables which are not related to each other? i.e. they don't have any common column? is it possible in SQL? My reader got confused because he only knows about INNER join and OUTER join which require a key column like dept_id which is the primary key in one table like Department and foreign key in another table like Employee. He couldn't answer the question, though he did tell them about you can select data from multiple tables by typing multiple table names in from clause using a comma. 

Difference between Primary key vs Candidate Key in SQL Database? Example

Primary key vs Candidate Key

What is the difference between primary key and candidate key is another popular SQL and database interview question which appears in various programming interviews now and then? The concept of primary key and candidate key is not just important from the interview point of view but also in designing databases and normalization. By the way, this is my second post about primary keys, In the last one, we have seen a comparison of primary key vs unique key, which also happens to be one of the frequently asked database questions. 

Difference between Clustered and Non-Clustered Indexes in Database? SQL Question Answer

Clustered vs Nonclustered Indexes in SQL
The difference between Clustered and Nonclustered index in a relational database is one of the most popular SQL interview questions almost as popular as the primary key vs unique key, the difference between truncate and delete, and correlated vs noncorrelated subqueries. Indexes are a very important concept, it makes your queries run fast and if you compare a SELECT query which uses an indexed column to one who doesn't you will see a big difference in performance. 

Difference between Primary key vs Unique key in SQL Database? Answer

primary key vs unique key in SQL
The primary key and unique key are two important concepts in a relational database and are used to uniquely identify a row in a table. Both primary key and unique keys can identify a row uniquely but there is some subtle difference between them which we will see in this article. In fact, primary key vs unique is a popular SQL interview question along with classics like truncate vs delete and  How to manage transactions in a database, mostly asked to fresher and 2 to 3 years experience guys in any programming language. SQL is not just limited to any DBA or PLSQL developer but it's an important skill even for Java programmers and you can expect SQL interview questions even in many Java interviews.

Where Is Python Used In The Real World?

Hello guys, if you are wondering where is Python used in real world before you decide whether to learn Python programming language or not then its actually a good question. While everyone is talking about Python's popularity, it make sense to do research and find out which industries in Software development is using Python as their primary language. You will be surprised to know that like Java Python is also almost everywhere. Python is now used in Artificial Intelligence, Web Development, Game Development, Building Desktop and UI Apps, Machine Learning, Data Science, Data Analysis, Building Mobile apps, Web Scrapping, and most importantly on Automation. So, you can see that Python is widely accepted and used and learning Python is the best decision you can take to start your career as Software Developer.

Top 10 tools for SQL Developers and Database Administrators

Hello guys, if you are a SQL database administrator a SQL Developer, a good knowledge of database tools can really help. It even been said that a craftsman is as good as his tools. So, you should spend some time and find out the tools which can help you with your job with respect to Database and SQL. Here are the main 10 free data set instruments that play out a great many explicit capabilities. The thought behind this rundown is to assist you with picking the right devices that best met your requirements.

Top 5 advanced JavaScript function concepts to Learn

Introduction:
A function is a piece or block of code that is created to perform single or multiple tasks. Every major programming language has functions because functions are one of the essential parts of modern programming. JavaScript also supports functions. Over time, JavaScript has upgraded functions in several ways to make them more programmer-friendly. In recent years, more and more advanced concepts are added in JavaScript. In this article, we are going to discuss the advanced working with functions in JavaScript.

Top 7 Gift Ideas for Programmers, Coders, and Software Developers in 2025 [UPDATED]

If you are planning for a surprise gift to your programmer boyfriend and husband this holiday season like Black Friday, Christmas, or New Year, or maybe on his next birthday, but not sure what to gift, then you have come to the right place. In this article, I am going to share some of the best gifts ideas for programmers and developers, gifts that every programmer wishes for. To be honest with you, buying a gift is easy, but finding the right gift is very tough. I have spent countless hours on the internet to find a perfect gift for one of my colleague's husbands, and this article is a result of that research.

Top 20 UI and UX Design Interview Questions and Answers

Hello folks, if you are a fresher who want to start your career in UI and UX design or a UI or UX Designer and preparing for your next job and looking for popular UI/UX  interview questions for preparation then you have come to the right place. Earlier, I have shared HTML Interview Question, CSS Interview Questions, web development questions, and JavaScript Interview Questions and in this article, I am going to share common UI and UX interview questions with answers. If you have worked in UI and UX design for quite sometime then you may know the answers of these questions but if you are new then you may need to go through these best UI and UX design courses to refresh you knowledge about essential UI and UX design concepts. 

Top 21 Chef Interview Questions and Answers for DevOps Engineers

Hello guys, if you are preparing for DevOps or SysOps interviews where Chef skills are required then you should prepare about common Chef Interview questions. If you already know this and looking for popular Chef Questions then you have come to the right place. Earlier, I have shared Interview questions on essential DevOps Tools like Docker Questions, Kubernetes Questions, Ansible Questions and in general DevOps questions and in this article, I am going to share common Chef interview questions and their answers. If you have used Chef in your project then most likely you will know the answers of all these questions but if you struggle to answer them then you can always checkout these Chef online courses to refresh your knowledge. 

Top 20 Shell Scripting Interview Questions and Answers

Have you struggle with Shell Scripting interview questions before? Have you been having problems in finding out the kind of questions asked in a Shell Scripting interview? If you have experienced this then it is high time that you find a solution. You cannot lose that dream job anymore and yet you can find with ease all you require to pass your interview. If that interview is a few days away, worry no more because you will get before that panel fully prepared and ready for the day by going through these common shell scripting questions. 

Top 20 Bootstrap Interview Questions Answers for Web Designers and Developers

Hello guys, if you are preparing for web design and development interview and looking for Bootstrap interview questions then you have come to the right place. Bootstrap is one of the most popular CSS Framework and almost all websites uses Bootstrap for their classy look and feel and bigger buttons and form elements. Earlier, I have shared HTML 5 Interview Questions and best online courses to learn HTML, CSS and Bootstrap courses and today, I am going  to share bootstrap interview questions with answers.  Here is a chance for you to make sure that you go into that Bootstrap interview with your head up high. Being ready for that interview is the major step that you can make as you seek to impress the interview panel on the interview day.

Top 20 Artificial Intelligence Interview Questions and Answers

Hello guys, if you are preparing for AI developer interview and looking for AI Interview questions and answers then you have come to the right place. Earlier, I have shared Python Interview Questions and Machine Learning Interview Questions and in this article, I am going to share 20 common Artificial Intelligence Interview Questions with answers for 1 to 2 years experienced professionals. If you have worked in the field of AI then you most likely know the answers of all of these questions but if you cannot answer then you can always check these best AI Courses to learn and improve your AI fundamental concepts. 

Top 20 Golang Interview Questions with Answers

Hello guys, if you are preparing for Golang Developer Job interview and looking for frequently asked Golang Interview questions then you have come to the right place. Golang is one of the modern and in-demand programming language from Google and more and more companies have started using Golang for their flagship project like ByteDance is using Golang for TikTok and their other projects. In the past, I have shared best Golang courses  as well as free Golang courses and in this article, I am going to share 20 common Golang Interview Questions with Answers. These questions covers essential Golang concepts which every Golang developer should be familiar with.

Top 20 Hadoop Interview Questions and Answers for Java Developers

With the increasing demand for big data processing and analysis, Hadoop has become one of the most sought-after skills in the IT industry. And what better way to showcase your knowledge and skills than by acing a Hadoop interview? But before you jump into the deep end, let's brush up on the basics. In this article, we've compiled a list of the top 20 Hadoop interview questions with answers. This will not only help you prepare for your interview but also give you a good understanding of the Hadoop ecosystem. So, put on your game face, get ready to have some fun, and let's get started!

Top 20 Google Cloud Interview Questions with Answers

Hello guys, if you are preparing for Google Cloud Developer or Administrator interview or looking for a job where Google Cloud skills are needed then you should be ready for Google cloud related questions on interviews. If you are looking for common Google Cloud Interview Questions then you have come to the right place. Earlier, I have shared 20 Cloud Computing Interview Questions, Azure Interview Questions, and 20 AWS Questions for interviews and today, I am going to share 20 Google Cloud related questions with answers, suitable for people with 1 to 3 years of experienced. 

Top 20 Kubernetes Interview Questions Answers for 1 to 3 Years Experienced

Hello guys, if you are preparing for Software developer or DevOps engineer Interview where Cloud Computing and Kubernetes skill are needed or mentioned in Job description then you should prepare for Kubernetes questions on Interviews. Kubernetes has quickly become an essential tool to deploy your application on Cloud and that's true not just for Java developers but also for Python, JavaScript, and Golang developers. If you already know the importance of Kubernetes and looking for common Kubernetes questions from interviews then you have come to the right place. Earlier, I have shared both Docker Interview questions and DevOps Interview Questions and in this article, I am going to share 20 common Kubernetes questions with answers.

Top 27 Dynamic Programming Interview Questions for Interviews

Hello guys, if you are preparing for tech interview or any Java developer interview then apart from preparing for Data Structure and Algorithms, and System Design, you should also prepare for Dynamic Programming questions. Dynamic programming or DP is a technique to solve a problem by breaking a big program into small sub-problem and then combining the result. It's very similar to Recursion and that's why Recursion also plays an important role in solving Dynamic programming questions.  When it comes to Interview, DP is one of the toughest topic to master.

Top 20 Unity Interview Questions and Answers for Game Developers

Hello guys, if you are preparing for Game Developer interviews where Unity or Unity 3D is listed as main skill then you must prepare Unity Interview Questions. If you already looking for Game Developer Interview questions and Unity questions for interviews then you have come to the right place. Earlier I have shared 20 Unreal Engine Interview Questions and in this article, I am going to share 20 Unity 3D Interview Questions with answers. If you have worked in Unity 3D then you can easily answer these questions but if you struggle to answer them then I also suggest you to checkout these Unity online courses to refresh your knowledge about Unity and the benefits it offer. Interviews are often difficult to crack because of vast variety of questions but knowing essential Unity concepts and best practices always helps.