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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

10 Hot IT Skills great demand Beyond 2020

The below are the highest demanding and high-paying IT jobs in 2016

Wireless Network Engineers can expect a 9.7 percent increase in pay, ranging from $108,750-$150,750, which is the highest increase in starting salary of all IT jobs in our guide! What’s going on here? The general push toward wireless offices and the growth of mobile application development, which requires testing mobile apps in a wireless environment, are just a few reasons for the increased starting pay. 

CRM Business Analyst-2015 salary: $84,500-$116,750 -2016 salary (est): $87,500-$126,000 - Percent increase (est): 6.1% 

Data Modeler - 2015 salary: $101,750-$145,250 - 2016 salary (est): $106,750-$155,500 - Percent increase (est): 6.2% 

Business Intelligence Analyst -2015 Salary: $108,500-$153,000 -2016 Salary (est): $113,750-$164,000 -Percent increase (avg): 6.2% 

Data Scientists and Big Data Engineers are both projected to see an 8.9 percent increase in starting pay over 2015, ranging from $109,000-$153,750 and $129,500-$183,500, respectively. Why the increase? More companies are using big data analytics to help inform business decisions and are relying on specialized personnel for managing and interpreting raw data. 

Mobile Application Developers are projected to see an 8.2% increase in starting pay, from $115,250-$175,750. Mobile app developers are in high demand due to growth in the use of mobile devices such as smartphones and tablets. 

Applications Architect -2015 salary: $115,750-$159,500 -2016 salary (est): $121,250-$171,750 -Percent increase (avg): 6.4% 

Data Architect -2015 salary: $119,750-$164,750 -2016 salary (est): $127,250-$175,500 -Percent increase (avg): 6.4% 

Web Developer -2015 salary: $73,500-$122,000 -2016 salary (est): $78,500-$129,500 -Percent increase (avg): 6.4%

Ref: Information week and Rh

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