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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

9 Top Git Terms You Should have Read By now

9 Top Git Terms to Read now


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 or more committed branches.


7. What is Pull

Pull means fetch from and merge with another local branch.


8. Fetch

In simple words, it means, downloading the objects and refs (Hash id) from another repository.


9. Checkout

It is the scenario, if you want to work with another branch you need to issue checkout. So that you can work with the new branch. And you will not lose any information about the current branch.


References

  1. Useful Guide - How to work with Git 

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