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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

Blockchain Smart Contract The Perfect Example

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The smart contract in Blockchain is a software application that works without human intervention. Here I have shared the Smart Contract backend process. Smart Contract Mechanism. 1. What is Smart Contract A smart contract is a protocol that can auto-execute, facilitate, verify, or enforce the negotiation of a contract. Agreement between two parties you can say as a contract. Incorporating the rules of the physical contract into the computing world, you can say as a smart contract Blockchain supports you to create smart contracts. Smart Contracts are self-executing programs that run on the blockchain and are capable of enforcing rules Using Blockchain as a platform and making an agreement or contract between more than two parties, you can say as Smart Contract. 2. Traditional Markets  3. Top Benefits of Smart Contract Currently, smart contracts are being used only in Crypto Currencies Now Smart Contracts being used in all financial transactions A smart contract ca