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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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Best Skills You Need to Become an IoT Developer

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The Internet of things is a new subject. In this area lot of development is going on. Recently, AWS (Amazon web services) developed a platform for the Internet of things. I want to share with you the best skills you need to become an IoT developer.


Best Skills You Need to Become an IoT Developer

Skills You Need to Become an IoT developer

This is a big Question for IT freshers or experienced IT professionals what technologies they need to learn to start a career in this line. 

As a general rule, I have found the following are general requirements for the Internet of things (See Internet of things jobs here).
  • Java + multiple programming languages (Objective-C, C++), and interest in technologies such as Ruby, Scala, Clojure, Groovy, etc.
  • Experience in javascript libraries in any combination of the following areas: jQuery, AngularJS, Backbone.js, Ember.js, Node.js, GWT
  • Development experience in open source projects, especially large scale projects a plus.
  • Experience developing at-home projects used by a medium to large size audience a plus.
Someone who is published, especially in development books and articles a plus.
  • How CISCO is responding to the development of IoT: The Internet of Things (IoT) is increasing the connectedness of people and things on a scale that once was unimaginable. Connected devices outnumber the world's population by 1.5 to 1. The pace of IoT market adoption is accelerating because of: (You can refer our article on IoT)
  • Growth in analytics and cloud computing 
  • The increasing interconnectivity of machines and personal smart devices 
  • The proliferation of applications connecting supply chains, partners, and customers

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