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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 AWS Services a Quick List

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In this post, I have explained the top AWS services list . These services are useful to read before your next interview. knowing this list is a must for all cloud-computing engineers. AWS provides various services. This post gives a clear understanding of AWS's top services.  AWS Books AWS in action AWS Cookbook Not only for traditional services, but it also offers services for Mobile IoS and Android Os.  Aws Service catalog  helps organizations to manage their IT services. AWS List of Top AWS Services Quick List These 9 Services of AWS are popular. I have explained each service to understand quickly. EC2 Lambda S3 DynamoDB IAM Amazon Cognito Device Farm Mobile analytics SNS 1. AWS EC2 Instance EC2: Amazon Elastic Compute Cloud (EC2) provides secure, scalable, on-demand hardware virtualization in the cloud. Using Amazon EC2 eliminates the need to invest in server hardware upfront so that users can focus on, develop, and deploy applications faster.  EC2 instances com