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SQL Interview Success: Unlocking the Top 5 Frequently Asked Queries

 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

These are energy analytics top areas to focus

energy analytics
Energy Analytics is a new area started recently. The below are the key points in analytics.

According to Siemens, Outsource your energy data management as a service and benefit from regular analyses performed by our energy experts. Evaluations show that this service makes it possible to easily achieve savings potential of as much as 5 percent.

Headlines of energy analytics

  • Market Forecast: Energy Data & Analytics
  • Energy Data Management & Analytics Business Skills
  • Big Data in an Utilities Environment: Real Case Studies
  • Advantages of Big Data & Analytics: Smart Metering & Cloud Computing
  • Innovative Solutions & Technologies
  • Data Analytics in a Smart Grid Perspective - DONG Energy Case Study
  • Big Data in the TSO Business
  • Achieving Benefits From Smart Meters Deployment With Advanced Analytics - Return on Experience From Large Scale Deployments in the US
  • Smart Grid Cybersecurity, Frameworks and Standards
  • Adopting Open Source Software in Energy Analysis
  • Data Analytics: The Backbone of the Emerging Smart City


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