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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

Skills Need Every Employee By 2020

With all the predictions about the future of work, we are constantly painting a picture of how the future workplace will look. But, what most of us should focus on is what the workforce will need to look like – meaning, what skills employees need to have to ensure continued success into the next decade?
The Top 10 Online Colleges website has the answer. They’ve done the research and compiled a list of skills that all employees will need by 2020 (which is only six years away!) and the drivers of the new skill set.
First, we must understand what is driving change and molding the future of work.
The six key drivers of change include:
  1. Extreme longevity: People are living longer.
  2. The rise of smart machines and systems: Tech will augment and extend our own capabilities.
  3. Computational world: There will be an increase in sensors and processing that will make the world a programmable system.
  4. New media ecology: There will be new communication tools that will require media literacies beyond text.
  5. Superstructured organizations: Social technologies will drive new forms of production and value creation.
  6. Globally connected world: Diversity and adaptability will be at the center of operations.


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