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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

Top Valuable Sources to Learn Predictive Analytics After Your Degree

The word predictive analytics is to increase competitive advantage and at the same time to suggest the best value products to end customers.

Data analytics
Data analytics

Why you need to go for predictive analytics

The reasons are

  • Growing data
  • Cheaper computers and servers
  • Easy to use software
  • Tough economic conditions

The predictive analytics helps in the following areas:

  • Detecting fraud
  • Improve marketing campaigns
  • Reduce risk
  • Improving operations
Growing data analytics creating many job opportunities.

Where You Need to Learn

  1. Do PG or post graduation in data analytics
  2. Attend Class Room Coachings

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