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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
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How to Find Folder Space in Linux Easily

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Here's an example that shows how to use find command to get directory utilized space in Linux. Many of a time during production support, or when crontab jobs failed, the reasons behind is space shortage of a directory. The find is handy you can use to get utilized space of a directory. That helps you to delete unnecessary files (that actually make some space). Linux find command Here's the find command that I  have used in our project . You will find here the detailed explanation of this command and how to use it. find  /home/srini -xdev -ls | sort +6rn | head -20 Part#1: Directory path In the first part,  after the find you need to give the directory's path for which  folder you are going to find  space. Part#2: Option -xdev The second part is  -xdev , which gives the space usage of all the subdirectories. Part#3: Option -ls The next part is the -ls option that provides a sorted list of all the subdirectories.  Part#4: Sort command Then, the sort command sorts based on the
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