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Welcome to SQL Class 6 of our Beginner-to-Job-Ready SQL Series! This session is interview-focused and highly practical, covering unique data retrieval, UNION operations, and the Top 10 SQL interview questions for Data Engineering roles. ⭐ What you’ll learn in this class: 🔹 1. Working with Unique Data What is DISTINCT in SQL? How to remove duplicate records Using DISTINCT with single & multiple columns Performance tips and common mistakes 🔹 2. UNION & UNION ALL What is UNION? Difference between UNION vs UNION ALL Rules for using UNION Real-world examples from reporting & data pipelines 🔹 3. Top 10 SQL Interview Questions (Data Engineering) DISTINCT vs GROUP BY UNION vs JOIN DELETE vs TRUNCATE vs DROP Primary Key vs Unique Key OLTP vs OLAP Subquery vs CTE Index basics NULL handling Real-time query scenarios Interview tips & best practices 🎯 Who should watch this? Freshers preparing for SQL & Data Engineering interviews Working professionals upgrading data skills Data analysts moving into data engineering Students targeting roles in: Data Engineering, Data Analytics, Backend Development, BI & Cloud 🚀 Why this class is important? DISTINCT and UNION are used daily in real projects Frequently asked in SQL interviews Builds strong query-writing confidence Helps you think like a data engineer 📌 Part of the SQL Job-Ready Series This is Class 6 of the SQL learning path. Upcoming classes will cover: Indexes, Joins Deep Dive, CTEs, Window Functions & Real-World Projects. 🔔 Subscribe & Turn On Notifications To stay updated with upcoming SQL + Data Engineering interview prep sessions.