These are the Top 5 Most Common SQL Questions for Data Engineering:


1. Total records after joining two tables on all types of joins
2. Rolling Sum and Nth salary based questions
3. Lag/Lead based questions e.g., consecutive months of increasing sales or YoY growth
4. Query to find employees who earn more than their managers
5. Removing duplicates from a table


Key Takeaways:
- Master window functions and joins
- Practice medium to hard SQL questions regularly

Getting good at SQL will pay off in the long run! 💪

Join our WhatsApp channel of Data Engineers: https://whatsapp.com/channel/0029Vaovs0ZKbYMKXvKRYi3C

Day 27/100

Tools & Tech Every Developer Should Know ⚒️👨🏻‍💻

❯ VS Code ➟ Lightweight, Powerful Code Editor
❯ Postman ➟ API Testing, Debugging
❯ Docker ➟ App Containerization
❯ Kubernetes ➟ Scaling & Orchestrating Containers
❯ Git ➟ Version Control, Team Collaboration
❯ GitHub/GitLab ➟ Hosting Code Repos, CI/CD
❯ Figma ➟ UI/UX Design, Prototyping
❯ Jira ➟ Agile Project Management
❯ Slack/Discord ➟ Team Communication
❯ Notion ➟ Docs, Notes, Knowledge Base
❯ Trello ➟ Task Management
❯ Zsh + Oh My Zsh ➟ Advanced Terminal Experience
❯ Linux Terminal ➟ DevOps, Shell Scripting
❯ Homebrew (macOS) ➟ Package Manager
❯ Anaconda ➟ Python & Data Science Environments
❯ Pandas ➟ Data Manipulation in Python
❯ NumPy ➟ Numerical Computation
❯ Jupyter Notebooks ➟ Interactive Python Coding
❯ Chrome DevTools ➟ Web Debugging
❯ Firebase ➟ Backend as a Service
❯ Heroku ➟ Easy App Deployment
❯ Netlify ➟ Deploy Frontend Sites
❯ Vercel ➟ Full-Stack Deployment for Next.js
❯ Nginx ➟ Web Server, Load Balancer
❯ MongoDB ➟ NoSQL Database
❯ PostgreSQL ➟ Advanced Relational Database
❯ Redis ➟ Caching & Fast Storage
❯ Elasticsearch ➟ Search & Analytics Engine
❯ Sentry ➟ Error Monitoring
❯ Jenkins ➟ Automate CI/CD Pipelines
❯ AWS/GCP/Azure ➟ Cloud Services & Deployment
❯ Swagger ➟ API Documentation
❯ SASS/SCSS ➟ CSS Preprocessors
❯ Tailwind CSS ➟ Utility-First CSS Framework

React ❤️ if you found this helpful

Coding Jobs: https://whatsapp.com/channel/0029VatL9a22kNFtPtLApJ2L

🔰 Java Roadmap for Beginners 2025

├── ☕ Introduction to Java
├── 🏗 Setup & IDEs
├── 🔢 Variables & Data Types
├── 📊 Operators & Expression
├── 🔁 Control Flow (if-else...)
├── 🔄 Loops (for, while....)
├── 🏗 Methods in Java
├── 📝 String Manipulation
├── 📦 Arrays & Collections
├── 🏛 OOPs
├── ⚠️ Exception Handling
├── 📂 File Handling in Java
├── 🔌 Multithreading
├── 🌐 Java for Web Dev

React ❤️ for more

Java projects with tutorial 🚀

Supermarket Management: https://youtube.com/playlist?list=PL-cxzMmn1xXEvQLajE2zYEfeF11lISJ0c&si=RwNa9HRFsrfFYvIy

Bank Management: https://youtube.com/playlist?list=PL_6klLfS1WqE1-_MJgZiJqAaccjLGHh0H&si=mw6PqEsAhrYskQjg

Cafe Management: https://youtube.com/playlist?list=PLdRq0mbeEBmwdwZF3lWwCcWmD76GfEFVT&si=opkQC14_5p3t0xBp

Chatbot: https://youtu.be/QP4HsdEPd-M?si=flwWw07VrWxr8qVY

Voting application: https://youtube.com/playlist?list=PLhHaibdHQVE1i3qWow-Mp0W_OrBrq1ykg&si=mtKqYDMxvgrMc97x

Food delivery: https://youtube.com/playlist?list=PL4fpXNDGXCyWXY7Sb_bp9VEENEW_UsG75&si=jHcdxrgbhbwvDqwa

University management: https://youtube.com/playlist?list=PL_6klLfS1WqH8iVglMyh7FVniAvD9Ar-E&si=i5jv8e6oj76BKQ7K

📍Free Courses, Jobs, Intermships Whatsapp Group 🔥 : https://whatsapp.com/channel/0029VamdH5mHAdNMHMSBwg1s

KPMG

Java OOP Concepts Cheat Sheet ☕📘

Master Java’s Object-Oriented pillars:

🔹 Class & Object
🔹 Inheritance
🔹 Polymorphism
🔹 Abstraction
🔹 Encapsulation

React ❤️ if you love clean Java code!

Java developer - Realistic Approach 💪🩵

1. Learn Java as a whole:
📍Beginner :
- Java Core: Java syntax , Collections framework , Exception Handling , Multithreading ,
File Handling
- Java Intermediate - JDBC , Design Pattern , Generics etc.

💪Pro :
- Advanced Java - Lambdas , streams , time , concurrency utilities , JVM internals
- Design Patterns - Creational , Structural , Behavioral

2. Build Tools:
- Learn and use popular build tools like :
📍Beginner : Maven (Web development) Gradle (App development)
💪Pro : Ant

3. Version Control:
- Master a version control system like Git. Master the skills for
📍Beginner : Github
💪Pro : GitLab , BitBucket

4. Command Line (This can be done parallel to the above 4)
Believe me when it comes to Java development Command line skills will be a boon for you guys.
Start with the basics for eg : install and setup java with Command Line only.

Start using Linux distributions ( it's very necessary ) go to a virtual box or dual boot your systems with any of Ubuntu , Kali Linux , Manjaro etc

5. Learn Servlets and JSP and then go for a framework ( Spring boot

Best Programming Resources: https://topmate.io/coding/898340

Join for more: https://t.me/programming_guide

ENJOY LEARNING 👍👍

29/100