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10 Essential Skills For Data Analyst in 2022

Hello guys, if you want to become a Data Analyst in 2022 but not sure which skills you need to succeed in this field or become a successful Data Analyst then you have come to the right place. In the past, I have shared essentials skills for Java developers and Python developers in 2022 and today I will share with you which skills you need to become a Data Analyst in 2022. Data analysis is a job in demand by most companies in the world who want to leverage the benefits of their data and make better decisions but analyzing data is not just knowing how to use a simple analysis software such as the Excel spreadsheet or visualize the data. It has many other skills you need to call yourself a data analyst.

[Solved] How to reverse an ArrayList in place in Java? Example

You can reverse an ArrayList in place in Java by using the same algorithm we have used to reverse an array in place in Java. If you have already solved that problem then It's a no-brainer because ArrayList is nothing but a dynamic array, which can resize itself. All elements of an array are stored in the internal array itself. By the way, if you need to reverse an ArrayList then you should be using the Collections.reverse() method provided by the Java Collection framework. It's a generic method, so you can not only reverse an ArrayList but also Vector, LinkedList, CopyOnWriteArrayList, or any other List implementation.

2 Ways to Check if a String is Rotation of Other in Java? Example

Write a program to check if one String is a rotation of another String is a common coding problem you will find on programming job interviews.  A String is said to be a rotation of another String, if it has the same length, contains the same characters, and they were rotated around one of the characters. For example,  String"bcda" is a rotation of "abcd" but "bdca" is not a rotation of String "abcd". One of the simplest solutions to this interesting problem is first to check if two String has the same length, if not then one String cannot be the rotation of another. If they are of the same length then just create another String by concatenating first String with itself, now check if second String is a substring of this concatenated String or not, if yes, the second String is a rotation of first.

How to Find Multiple Missing Integers in Given Array of Numbers with Duplicates in Java?

Hello guys, It's been a long time since I have discussed any coding or algorithm interview questions, so I thought to revisit one of the most popular array-based coding problems of finding missing numbers in a given array of integers. You might have heard or seen this problem before on your programming job interviews and you might already know how to solve this problem. But, there are a lot of different versions of this problem with increasing difficulty levels which interviewers normally use to confuse candidates and further test their ability to adapt to frequent changes, which is key to surviving in the ever-changing software development world.

50 Free Spring Professional Certification Practice Questions with Answers [VMWARE EDU-1202 Exam]

Hello guys, preparing for IT certification like Oracle's Java certification or Vmware's Spring Certification required a lot of hard-work. I have seen many experienced Java developers failing these certifications and losing money and time due to over-confidence and lack of preparation. A structured preparation involves reading books, joining course and doing practice questions. When it comes to Spring certification, practice questions are quite hard to find and that's why I created my Udemy course with 250+ Spring Certification questions. This course has helped more than 9000 students in their Spring certification preparation journey. 

The 2022 iOS App Developer RoadMap

Hello guys, if you want to become an iOS App developer and looking for a solid roadmap then you are not alone. I was also looking for iOS app developer roadmap when I stumbled upon this awesome looking iOS developer RoadMap on Reddit. This is one of the comprehensive roadmap to take your from zero to master in iOS App Development but its also too much comprehensive and hard to follow. To be honest, I cannot learn all the skills mentioned in this RoadMap unless I spend all of my time on learning them for another 5 to 10 years. So, I created a simplified version of my own iOS developer RoadMap where you only need to learn essential skills to start doing iOS Development and start your career as iOS App developer.

Top 30 Linked List Algorithm Questions from Programming/Coding Interviews

The linked list is one of the most common and essential data structure and that's why you would frequently find linked list based coding questions on interviews. The range of questions can be from simple questions like finding the length of a linked list to very difficult like merging two sorted linked lists. Nevertheless, the point is that you should be familiar with linked list data structure and must know how to perform basics task in the linked list e.g. adding or removing nodes from a linked list, traversing order linked list and implementing linked list in your choice of programming language like Java, C++, C, or Python.

How to Print Fibonacci Series in Java without Recursion - Coding Problem for Beginners

Fibonacci series is a great example of Dynamic Programming, Recursion, and how the use of Recursion can result in a clear and concise solution. That's why whenever asked about writing a Java program to get Fibonacci numbers or print the Fibonacci series of certain numbers, it's quite natural for programmers to resort to recursion. The interviewer often challenged this practice by asking candidates to implement the Fibonacci series without using recursion. Yes, you read it right, you can't use recursion and this is what you will learn in this article. If you have attended your programming classes regularly then you may know that many recursive algorithms also have their iterative counterpart which uses loops instead of recursion or calling itself. We will take advantage of that concept to devise a solution to this problem.

How to set an "Accept:" header on Spring RestTemplate request? Example Tutorial

RestTemplate is one of the most commonly used tools for REST service invocations. So one of the major problems you might have in this RestTemplate is that how to set an "Accept" header on Spring RestTemplate request.  In the last article, I have shown you how to POST and Consume JSON using RestTemplate in a Spring Based Java application and In this tutorial, we will go through some important points on how to add headers to RestTemplate and fix the errors related to them. 

Difference between Statement vs PreparedStatement vs CallableStatement in Java JDBC

Hello Java programmers, if you are looking to find out the difference between Statement, PreparedStatement, and CallableStatement in Java then you have come to the right place. Earlier, I have shared common JDBC Interview Questions and in this article, I am going to explain what is the real difference between these Statement types in Java and when to use Statement, PreparedStatement, and CallableStatement in Java programs. JDBC API provides several classes and interfaces for various things, but three of the most important types of Statement classes are Statement, PreparedStatment, and CallableStatement. They are designed to execute different types of SQL queries

What is Bean scope in Spring MVC Framework with Example

Java classes or POJO which are managed by Spring Framework are called Bean or Spring Bean and Bean scope in Spring framework or Spring MVC is scope for a bean managed by Spring IOC container. You may know that Spring is a framework that is based on Dependency Injection and Inversion of Control and provides bean management facilities to Java application. In Spring-managed environment bean (Java Classes) are created and wired by the Spring framework. Spring allows you to define how those beans will be created and the scope of the bean is one of those details. Scope are similar to access modifiers in Java which specifies visibility of a particular class. 

Top 10 Udemy Instructors to Learn Software Development in 2022 - Best of Lot

Hello guys, if you are thinking to learn Software development on Udemy but not sure which Udemy instructor has best Software development courses or which is the best software development instructor then you have come to the right place. Earlier, I have shared best Software development courses from Coursera and best coding courses from Educative and in this article I will share the best Udemy instructor to learn Software development But, before we get to the 10 best Udemy instructors that will teach you everything you need to know about software development, let me tell you more about Udemy.

String vs StringBuffer vs StringBuilder in Java? Example

Difference between String, StringBuffer, and StringBuilder
The String is one of the most important classes in Java and anyone who starts with Java programming uses String to print something on the console by using famous System.out.println() statements. Many Java beginners are not aware that String is immutable and final in Java and every modification in String creates a new String object. For example, when you get the substring, you get a new String, when you convert uppercase String to lowercase, a new String is created. Even when you remove space by calling the trim() method, a new String is returned. 

[Solved] How to find first recurring character in given String? [Google Interview Question]

Hello guys, while surfing the Internet for a couple of weeks back, I come to know that this problem was asked on Google interviews, find the first recurring character in a given String. I don't know if that's true but this looks like a very simple coding problem from Google's Interview standard. If it was indeed asked, then that guy must have been very lucky. Anyway, I liked this coding problem and thought to write about it, because it's a good coding problem to check candidates' data structure and algorithms skills because it's tricky. It's tricky because it's very easy to make a mistake assuming just one recurring character in String, which you should avoid.

5 Ways to find length of String in Java - Example Tutorial

On another day, someone asked me, is there a way to find the length of String without using the length() method from java.lang.String class? I didn't ask why, because I know it might have been asked to him on Interviews. Before I explore ways to find the length of String, let's recap what does the length of String means in Java? Well, it's no different than C here, a number of characters in a String including whitespace, newlines are known as length of String. By knowing this, you can think of many approaches to calculating length e.g. getting a char array from String and counting a number of characters or many are by applying some clever tricks.

5 Projects You can do to learn Flutter in 2022

Learning Flutter to build mobile apps for android and iOS does not make you a professional developer that people can rely on you to build their app. In fact, you need to train as much as possible to create mobile apps so you can consider yourself a mobile apps developer. If you are now in the stage of learning Flutter for creating mobile apps and you want to enhance your skills by building as much as possible mobile apps for both platforms android and iOS you’ve come to the right place.

10 Examples of Joining String in Java - String.join vs StringJoiner

It's quite common in day to day programming to join Strings e.g. if you have an array or List of String let's say {Sony, Apple, Google} and you want to join them by a comma to produce another String "Sony, Apple, Google", there is not an easy way to do it in Java. You need to iterate through an array or list and then use a StringBuilder to append a comma after each element and finally to remove the last comma because you don't want a comma after the last element. A JavaScript-like Array.join() method or join() method of Android's TextUtils class is what you need in this situation. Still, you won't find any such method on String, StringBuffer, StringBuilder, Arrays, or Collections class until Java 8.

Difference between Period and Duration class in Java 8? [Example]

What is the difference between Period and Duration class in Java is one of the popular Java 8 interview questions and has been asked too many of my readers recently. If you were also wondering the difference between Period vs Duration and when to use Period over Duration and vice-versa then you have come to the right place. Java 8 has two classes to represent differences in time like Duration and Period. The main difference between Period and Duration is that they represent the difference in different units, A Duration is used to calculate time difference using time-based values (seconds, millisecond, or hours) but Period is used to measure the amount of time in date-based values like days, months and year.

The 2022 Data Analyst Roadmap

Hello guys, if you are want to become a Data Analyst but not sure which skills you need and how to acquire those skills then you have come to the right place. Earlier, I have shared roadmaps to become a Java Developer, Web Developer, and DevOps Engineer and in this article, I will share Data Analyst RoadMap which will help you to become a Data Analyst in 2022. All companies have data about their customers to improve their service and get valuable insight and a much better understanding of the customer's behavior. This can be done by hiring data analysts in your company to leverage the benefits of this hug customers' data.

3 Ways to Remove Duplicates from a table in SQL - Query Example

There are a couple of ways to remove duplicate rows from a table in SQL e.g. you can use temp tables or a window function like row_number() to generate artificial ranking and remove the duplicates. By using a temp table, you can first copy all unique records into a temp table and then delete all data from the original table and then copy unique records again to the original table. This way, all duplicate rows will be removed, but with large tables, this solution will require additional space of the same magnitude as the original table. The second approach doesn't require extra space as it removes duplicate rows directly from the table. It uses a ranking function like row_number() to assign a row number to each row.

How to use EXISTS and NOT Exists in SQL? Example Query and Tutorial

Hello Guys, you might have heard about how useful the EXISTS clause is helpful in writing sophisticated queries. Still, at the same time, I have also seen that many programmers struggle to understand and use EXISTS and NOT EXISTS clauses while writing SQL queries.  If you are one of them, then you have come to the right place. Today you will learn how to use the EXISTS clause in SQL by picking up a real-world example and an excellent SQL exercise from the LeetCode. Suppose that a website contains two tables, the Customers table, and the Orders table. Can you write an SQL query to find all customers who have never ordered anything?

10 Best Courses Of Brad Traversy on Udemy to Learn Web Development

Hello guys, if you are looking for best web development courses then learning from Brad Traversy is a great idea. He is one of the most engaging instructor on Udemy and having attended his web development courses on Udemy and watching his crash courses on Youtube, I really liked his crystal clear teaching style. A lot of you asked me about the best web development courses so I decided to compile all of his best courses into one article and here we are. But, before we get to the 10 best courses of Brad Traversy, let me tell you who he really is and why he is one of the most popular instructors on Udemy.

5 Examples of GROUP BY Clause in SQL with Aggregate Functions

There is no doubt that SQL is an essential skill and every programmer, developer, DevOps, and Business analyst should know SQL. If you want to learn SQL from scratch then you have come to the right place. Earlier, I have shared many SQL interview questions and the best SQL courses for beginners, and today, I am going to share some GROPU By examples in SQL to write aggregation queries. THE GROUP BY clause in SQL is another important command to master for any programmer. We often use the GROUP BY command along with a select clause for reporting purposes, since the GROUP BY clause is mainly used to group related data together it's one of the most important SQL commands for reporting purposes. 

What is difference between SQL, T-SQL and PL/SQL? [Answered]

Today, we are going to see another common and interesting SQL interview question, what is the difference between SQL, T-SQL, and PL/SQL? It is also one of the most common doubts among SQL beginners. It's common for programmers to think that why there are many types of SQL languages, why not just single SQL across DB? etc. Well, let's first understand the difference between SQL, T-SQL, and PL/SQL, and then we will understand the need for these dialects. SQL is standard for querying, inserting, and modifying data in a relational database. It is categorized into DDL and DML and is powerful enough to create database objects e.g. table, view, stored procedure, and can perform CRUD operation (SELECT, INSERT, UPDATE, and DELETE) query.

3 ways to learn MERN stack in depth in 2022

Hello guys, if you want to learn MERN Stack in 2022 but not sure where to start then you have come to the right place. Earlier, I have shared best courses to learn MERN Stack and in this article, I will share 3 ways to learn MERN stack from scratch. If you don't know MERN stack is one of the most popular and widely used web development stacks in the world. MERN stack uses React on the client-side while Node.js with Express.js on the server-side and MongoDB is used as the database. All the four technologies used in the MERN stack are widely used and because of this, their combination is also very popular.