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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

Networking in IoT age for big opportunities (1 of 3)

Networking is common in the age of IOT. The basics I want to say are networking means connecting objects together. The networking is possible with wires and without cables. The without cables you can say as wireless.

How Computers Connected

  • Computers are connected by using fiber cables. Each computer is connected by cable to a central switch, which connects to the rest of the network  
  • The advantage of wireless networking is no cables required. In a wireless network, most cables and switches are moot. Radio transmitters and receivers take the place of cables.
  • Networking software must be installed. This drives networking functioning.

Benefits of network

  1. To share resources
  2. Sharing information
  3. Sharing applications


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