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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 Modernize Software Applications with AI (2 of 3)

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Creating like human intelligence in devices, the software also called artificial intelligence. Ambient intelligence because of its interactivity with the user is an attractive medium to advertisers. Some examples:
IoT Devices
Human Intelligence
Adswitch

This could be a large step forward for the advertising industry as not all adverts are able to reach their potential customers and now advertisers can target the correct market as the advert will adapt to the changing environment.

Ambient Intelligence
  1. The application of Ambient Intelligence in the Home Automation field is likely to continue as it can be simply allowed to disappear into the environment without homeowners having to notice it carrying out the complex instructions that would make lives easier.
  2.  It is also likely that newer methods of interacting with the interfaces will be a hot area for some time to come as speech and touch have specific limitations. It can be argued that one of the main reasons that ambient intelligence has not been implemented widely today is due to the constraints that come with it. 
  3. For instance, to have every object made intelligent requires mass-produced nano components yet nanotechnology is complex and hard to work with, the time it takes to develop devices with nanotechnology is much longer due to the fact that everything that is in the design must be built on a very small. 
  4. There is also the aspect of security with Ambient Intelligence and if people are not willing to trust the ambient technology then it will fail. In Ambient Intelligent environments, information not only resides in one node but is distributed between many therefore every single node within the system needs to be protected.
Wakeup Alarm

Some of these products are at the early stages and some are in niche markets. Take, for instance, the award-winning 'Philips Wake-Up Light'.
  • This alarm clock with a 300 lux light bulb can be used by anyone to help them wake up more naturally (by dawn simulation - so replicating waking up as nature intended - by sunlight). This means people feel more refreshed and ready to hit the day rather than being woken abruptly by a loud, sudden beeping.
  • In fact, you can set it to 3 natural sounds (morning birds, seashore, pond) or your favorite digital FM radio station. What is the relationship between Ambient Computing and an alarm clock? Well, the clue may be in the manufacturers of this product ‥‥Philips.
  • One such Intelligent Advertising project is a switch that is designed to change when someone approaches the advert as their gender and age will be determined to evaluate an advertisement suitable to the user. 
  • For instance, as the elderly woman moves to the head of the queue, she is shown the advert for retirement homes and when the teenage boy heads the queue, some computer games adverts will play. Ambient intelligence is beginning to have an influence on the marketplace today.

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