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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

The Real Use of Git in DevOps Environment

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Why you need Git? Here's well explained with differences among Git, GitFlow and GitHub. Git is a tool It is created by Linus Torvalds , the creator of the Linux system. The tool was created to help Linux developers control the development flow among many developers around the world. It helps to solve conflicts, track the modifications, or even revert the configurations that were working before and stopped working in a new version. To install Git, you can access the following link:  https://git-scm.com/download/win The installation process is the same as we did for all Windows applications; it is just Next, Next, and Finish. After the installation, you will find a new program called Git Bash, which allows you to create your local repos and use the Git commands to create versions of your application. GitFlow Now, when we start working on a project, we have the code files that are already in production, and we cannot work in the main branch, because of the CI/CD pipelines. We need to

9 Top Git Terms You Should have Read By now

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GIT is version control system. That means it manages your code versions. However, I have given here most frequently asked terms in interviews. 1. Git Vs GitHub This is the first question you ( even me also) might confuse about. Git is the version control system. Whereas  GitHub is a repository framework . Also, you can say GitHub is Git hosting service. 2. What is Branch Git is a lightweight version control system. In simple terms, a Branch is a separate line of development. You can have any number of branches in Git. 3. What is Topic Each branch in Git refers to a particular purpose. So the topic tells about the purpose. 4. Clone In easy terms, the Clone means copying an existing repository. So you can say it is just a copy of the existing repository. 5. What is Push You can say Push means updating the existing repository. In other words, developers push their changes to a repository that you set up. 6. Merge Merge unifies two or more commit history branches. That means it merges two