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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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2 Top Differences Automation Vs Internet of Things

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Five reasons why IoT automation provides opportunities to deliver better product or Services. The data from sensors is a golden asset to derive benefits and to apply in products or services.

Automation and IoT both are different 

Automation

The automation is based on the data collected from various devices and make it happen when something goes wrong you can say as automation.

The best example is based on sensor generated data the automation tool take corrective action during course of flying from one country to other.

  Internet of Things

  1. More mobile phones than fixed
  2. New architecture models (ex: Cloud computing)
  3. The new protocol (Ipv6)
  4. Everything is Sensor-laden
  5. More machines than people

The Growth of Internet Usage

The internet will be double in size every 5.32 years. More devices can be connected to the internet through IP. The internet limitation in IPv4 is 4 billion addresses.

But, the internet limitation for IPv6 is 2^128. The total IP traffic over the internet is 1 ZettaByte as of 2011.

Data process
Wisdom from Data

Data 

  1. Information-It is the data after you did clean the raw data.
  2. Knowledge-The ideas or patterns you obtain from cleaned data.
  3. Wisdom-Building models and you can make automate the certain task.

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