Showing posts with the label Terminology

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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

9 Top Git Terms You Should have Read By now

GIT is version control system. That means it manages your code versions. However, I have given here most frequently asked terms in interviews. 1. Git Vs GitHub This is the first question you ( even me also) might confuse about. Git is the version control system. Whereas  GitHub is a repository framework . Also, you can say GitHub is Git hosting service. 2. What is Branch Git is a lightweight version control system. In simple terms, a Branch is a separate line of development. You can have any number of branches in Git. 3. What is Topic Each branch in Git refers to a particular purpose. So the topic tells about the purpose. 4. Clone In easy terms, the Clone means copying an existing repository. So you can say it is just a copy of the existing repository. 5. What is Push You can say Push means updating the existing repository. In other words, developers push their changes to a repository that you set up. 6. Merge Merge unifies two or more commit history branches. That means it merges two

The Essential Guide to Blockchain Terminology

Bitcoin was the first project developed by using blockchain. My post is to share Blockchain keywords by using an example of Bitcoin. Let us ready... Blockchain is new technology. Understanding its principles makes you helpful to apply in your projects.  Initially, the purpose of  Blockchain development was to carry mining. In general, mining means search and find value. Usually, mining processes are two types. Those are data mining and bitcoin mining . Blockchain Glossary Blockchain - only blocks involved. The data which was finalized stored in blocks. Bitcoin Ledger - It is a public ledger Ledger or Blockchain - The chain of blocks Functions of Blockchain - It validates each transaction, Keeps track, and verifies ownership Double Spending- It prevents duplicating the Cryptocurrency for using next time. Consensus mechanism - It is also called PoW (proof of work). This mechanism avoids double-spending Group of Transactions - When a new group of transactions created, t

13 Cloud Computing Terminology Quick Read

Cloud computing is a big ocean. Due to increased services, a developer must know the glossary ( keywords) involved. 1) AWS Amazon Web services 2) Content delivery network (CDN) It is a distributed system. Servers are located in remote locations. Customers feel that they are accessing the servers. 3) Cloud A global network to access the resources. 4) Cloud portability The feature to move data from one Cloud provider to another provider. 5)  Cloudsourcing Moving traditional IT operations to Cloud computing. 6) Cloud storage It is a service providing to users to store data using the internet or other private networks. 7) Cloudware It is Software that helps to run user applications in cloud computing. Terminology 8) Cluster A group of small computers connected together to form a Single big computer. High availability and load balancing are the main benefits. 9) Consumer cloud The cloud provider offers services to individual users. You can call it a consumer cloud. 10) Consumption-bas